Only packs and site options are available
Lightweight and durable backpacks from a simple and rational building.
Concept: minimal accessories well placed for maximum efficiency!
Main application: Ultralight hiking, ultralight trekking....
KS packs series Fit:
Innovative fabrics, the weight / resistance ratio optimized for safe and sustainable using.
A large main compartment, simple and convenient to use.
A large front pocket 8L (January 2025), made with UltraStretch to store shelter, clothing or other items even wet. Weight: 192 gsm
(＊= for KS4,40,50,60, Omega, Alpisack, R-35-50, Tao pack, KS35Z)
A wide padded belt (KS 40/50) with 10 mm foam (more firm foam since Oct 2022) covered inner side by 2mm 3D mesh, very comfortable and provide good load report on hip (with 25 mm webbing by default).
The padded part size is the same for every packs, the webbing strap length is adjusted according to customer waist size.
2 side pockets compact and easily accessible even the pack worn, closer to the hips and lower back, ensuring comfort and balance. (drainage holes at corner bottom)
Side pockets enlarged (again) Avril 2023.A system of lateral shock cords, simple, light but very efficient (two 3 mm cord x 80 cm = +8 gr) / by line locks , 11 loops in total including for the front pocket to allow shock cord lashing.
Top closure by simple and convenient by draw cord and 13 mm webbing strap (about 60 cm), which is fixed between the start of the shoulder straps up to the front pocket, making a load lifters effect .
13 mm webbing Sternum strap included, height adjustable on daisy chain and removable ( +9 gr) .
13 mm webbing Sternum strap included, height adjustable on daisy chain and removable ( +9 gr) .
Every pack come with 1,8 meters of 2mm elastic shock cord and 1 cord lock to secure your sit pad on back or to use on the front pocket etc..
6 bottom additional loops in option.
2 removable waist pockets for all models in option.
Available in:
4 volumes: 28L, 38 L, 48 L, 58L
All KS packs fits small and are highly compressible, when hesitate, skip to a superior size for versatility may be suitable.
---------------------------------------------------------------------------
For bottom, Shoulder strap, padded waist belt and side pockets, 330D cordura black fabric is used by default, change are possible by Option here.
Nylon Spectra or UltraGrid 200 are also available for bottom, side pockets waist belt and shoulder straps here:option.
 |
| KS40 with 2 X 73mm diameter bottle |
 |
| 2L Bottle in KS50 (and Omega 56) pocket secured by bungee cord |
Side pockets compact and easily accessible even the pack worn.
All pockets enlarged (again!) Avril 2023,
KS40 one side pocket fit now two 1 liter smart bottles, Diameter up to 75mm X 2.
Pocket are now at the maximum possible size, if you need a bigger, skip to the superior pack size, details:
Circumference at top of the pocket:
KS30= 36 cm, KS40= 40 cm, KS50=44 cm KS60= 49 cm,
To fit inside the pocket, items must be significantly thinner than the circumference, especially if the bag is rounded in its contents.
 |
Default 13 mm strap and hook clipped on D ring, keep secured even without tension on strap (Twice stronger than 13 mm buckle for same weight. Buckle it is still available in 20 mm size option) |
 |
| Drawstring top closure by default: Draw cord/ cord lock (in PIC) covered by 13 mm compression strap. |
 |
| 8L default front pocket with 5 front loops for bungee cord with UltraStretch mesh, only available for the front pocket |
 |
| Default Bottom and side pockets in cordura to modify: Explanation here. |
Included loops allow to use your pad on back
(Not included when sit pad pocket option, 3D mesh or cordura padded back option, Anatomic belt option, no top and bottom loops in this case) Z-lite pad in picture
The pad length limit is above your torso size, the pad thickness has no limit but the more the pad is thick, the more the pack goes away from your back, same for the load transfer and the shoulder straps turn shorter or even too short...
-----------------------------------------------------------------------
5 torso sizes: 44 cm, 47 cm, 50 cm, 53 cm, 56 cm
1) Measure your back (torso size) like this X (up to C7, not trapezius) and add 3 CM
2) And measure your usual backpack to be sure, bottom of the pack up to start of shoulder strap Y (If start part is inclined, take at middle point of one strap)
3) By default (Subject to differ according to your legs length): for 1m62 ---> 44 cm 1 m 68---> 47 cm, 1m74--> 50 cm, 1m80-->53cm, 1m86-->56 cm ( Asiatic people may add 3 cm for this method)
When you are between 2 sizes, take the bigger size.
 |
| Measure Belt hip size at larger part of ilium 75-84 range usable from 73 cm up to 90cm 85-94 from 75 cm up to 100 cm 95-104 from 75 cm up to110 cm 105-114 from 75 cm up to120 cm |
Load lifter option is recommended for adjust your backpack torso length. (increases the length effect)
The weight of backpack are estimated with a a medium belt (for 90 cm usual pants belt) without accessory (sternum strap, bungee etc..) and without options.
| KS 50 or 60 total length (collar full opened) is 80 cm, 75 cm for KS 40, 70 cm for KS30 |
--------------------------------------------------------------------------------------------------------------------------
KS 30
Volume total : 28L ( 18 L body +8 L front pocket +1+1L side pocket),
Estimate weight (without accessories, sternum strap, bungee cord..): 350 gr UltraGrid 200 or VX07.
For recommend base gear list up to 4 kg, comfort limit up to 9 kg, limit total loads up to 12 kg .
Maximum pack collar length = 70 cm, if you wear 53 cm or 56 cm torso size, consider the 10 cm extension collar option below.
--------------------------------------------------------------------------------------------------------------------------
KS 40
Volume total : 38L ( 27 L body +8 L front pocket +1,5+1,5L side pocket), (Bear canister compatible only at outside top, BV500 can enter inside but the pack turn full rounded)
Estimate weight (without accessories): 380 gr UltraGrid 200 or VX07 . For recommend base gear list up to 4 kg, comfort limit up to 9 kg, limit total loads up to 12 kg . (SUL version of KS 30 and 40 here)
--------------------------------------------------------------------------------------------
KS 50 (Compatible BV500 inserted vertically inside, best location between shoulders according to my test)
Volume total 48 L (36+8+2+2),
For recommend base gear list up to 4 kg, comfort limit up to 9 kg, limit total loads up to 12 kg . Estimated weight (without accessories) : 400 gr UltraGrid 200 or VX07.
--------------------------------------------------------------------------------------------------------------------------
KS 60, Roomy size to insert inside vertically bear canister with more comfort than KS50 or for bulky winter gears.
Volume total 58 L (45+8+2,5+2,5),
For recommend base gear list up to 4 kg, comfort limit up to 9 kg, limit total loads up to 12 kg.
Estimated weight (without accessories) : 420 gr UltraGrid 200 or VX07.
Estimated weight (without accessories) : 420 gr UltraGrid 200 or VX07.
--------------------------------------------------------------------------------------------------------------------------
Measure Belt hip size at larger part of ilium
75-84 range usable from 73 cm up to 90cm85-94 from 75 cm up to 100 cm
95-104 from 75 cm up to110 cm
105-114 from 75 cm up to120 cm
--------------------------------------------------------------------------------------------------------------------
IMPORTANT color information:
RED is EPX 200 version Red brick
Green is UltraGrid 200 Avocado green
200D Nylon/spectra BLACK is replaced by UltraGrid 200 Black (with white grid)
For more FABRIC INFOS and colors click: HERE
EPL 200 X ULTRA option here
(Price not include shipping fee and have to be added here)
KS Packs order:
--------------------------------------------
Front pocket fabric or Nylon mesh net options if not default ULTRA-STRETCH mesh
Cordura or VX21 black add 10 gr, X07 soft, 200D save 5 gr, other X-pac, Ecopak add 10 gr,
Nylon mesh net no change weight.
 |
Cordura Fabric front pocket option finish: with strong mesh at the bottom to drain water. |
 |
| Nylon Mesh Net |
--------------------------------------------------------------------
Ice Axes or trekking pole loops holder :
Fit 2 up to 6 loop/cord lock at up and low part , add 5 gr for 2 loops.(Options can be cumulative, for ex: Option for pole both sides + for ice axes at one or two sides)
 |
| Trekking pole loops holder (left side). 35 cm between loops. |
 |
| Ice axe loop holder (right side) |
-----------------------------------------------------------------
Removable pocket 1L:
Weight around: 24 gr LS07, 28 gr X21RC or 200D, 30gr VX07, 35 gr VX21
(Strap option to turn the pocket as a satchel here)
----------------------------------------------------------- | |
|
(This pocket is compatible with internal pad pocket option but not with internal pocket option.) Add 3 gr or 20 gr
compatible with removable internal pocket option.
 |
| Placed at center, allow right or left pipe way out. |
 |
| Water pouch + hook |
______________________________________________________
Back Padded option:
(Lumbar part included)
3D mesh back (add 30 gr approx)
or 3D mesh back padded with not removable 8mm foam pad (add 60 gr in total.)
or NEW BLACK Cordura back padded with not removable 5 or 10 mm foam pad (add 45-65 gr approx)
(No loops at top and bottom for exterior pad lashing in all this case)
 |
| Only 3D mesh back =2 mm (No loops at top and bottom for exterior pad lashing) |
 |
| 3D mesh back padded with not removable 5 mm foam. (total= 7 mm) (No loops at top and bottom for exterior pad lashing) |
 |
| Cordura + not removable 10 mm foam pad (No loops at top and bottom for exterior pad lashing) |
------------------------------------------------
Internal pocket fixed or removable:
(around 20cm x 21cm) made of nylon ripstop 70 D black, closed by mini velcro or YKK zip, FIXED: 9/11 gr
REMOVABLE for UL satchel use fit hook and round cord: 17/21 gr
Only Removable is compatible with hydration pocket option.
 |
| FIX |
 |
| REMOVABLE for satchel use |
Large belt option, 38 mm with dual Adjust Side Release Buckle (in place of 25 mm default) for confort and better load report on waist.
Add 9 gr in 85-94 cm belt size range:
 |
I tried double 25 mm strap, it is not as efficient as my single 38 mm belt strap, in fact only the superior strap supports the main effort, less comfortable and heavier ! |
20 mm removable air sternum strap with whistle, (height adjustable by sliding on strap) weight 18 gr but add only 9gr from standard default 13 mm sternum strap.
Usable length 40 cm VS 30 cm for default 13mm model.
Comfortable and convenient even in cold condition.
Dry bag type top closure system:
Or by snaps (New)
Top 15 mm buckle:
 |
| By Snaps |
The backpack don't turn waterproof with this option.
(Associate with extension collar option is recommended mostly if you have 56 cm torso size, to increase rolled part longer)
Sit Pad sleeve pair:
Fabric choice:
200D For tear resistance and design
330D For abrasive resistance and black color
3D mesh For additional cushion, elasticity and breathability.
NEW! UltraStretch for tear, abrasive resistance, breathability and stretchy!
200D add 16gr cordura 330D 18 gr 3D mesh add 24 gr
For pad length= your torso size X 25 cm X 3 cm max
  |
| Made of 3D mesh add 24 gr |
 |
| New UltraStretch fabric |
Sit pad are sold below
Sit pad size around 25 cm width X your back length size, in durable ( Made in Japan) PE foam, 10 mm, color grey.
weight around 35 gr (torso 53 cm)
Price 1500 JPY
Zipped front pocket option 7L + 10 gr:
(YKK Zip)
Fit hole at lower corners to drain humidity.
Internal pad holder corners set:
Usable Width = 25 cm, length = your torso size less 6 cm:
Using with removable pad, make the back of the pack more comfortable and more rigid.
Weight + 5 gr
Weight + 5 gr
10 mm Pad in option, shaped and weight according to your back size + 40 gr.
Load lifter strap :
Brings the weight of the pack towards you:
For frame less pack, the load lifter system work well only when the pack is full.
Load lifter option is recommended also for adjust your backpack torso length. (Increases the length effect)
Lineloc +Cord add 9 gr , 20 mm webbing add 17gr. The 2 solutions works well, the cord may be changed when degraded, 20 mm strap may have easier handling .
 |
20 mm webbing
|
 |
| Linelock + cord |
| ------------------------------------------------------------------------------- |
Upper side pockets pair
They are quite flat to not interfere with the pockets below or your arms, you can also use the side cord to prevent content from sliding down:
(EPL 200 option here)
 |
| Strong mesh |
 |
| Fabric with 500 ml bottle (Fit hole at low corner to drain water) |
Removable Frame set :
Easily removable (10 sec) frame aluminum tube, weight according to your torso size around 50 gr (25 gr + 25 gr for stays) + 10 gr for fixed loops. Associate with 38 mm waist strap/buckle option is recommended. Comfort increased with this 2 options.
New: you can order the system without tube and use yours: Tent pole, Carbon pole for ex in sale here, DIY etc...tube length =your torso size + about 20 mm diameter 8 or 9 mm. I suggest putting duct tape on the end of the tube to prevent abrasion and increasing the diameter to secure the whole thing without a gap.
Associate with load lifter strap or cord option is also recommended.
This option is compatible with backpack: KS packs, Alpisack, R-50, and all options even anatomic padded hip belt option.
--------------------------------------------------------------------------------
Recommend to use with your sit pad in back, extern or intern, to keep distance from of the tube.
Bottom loops options:
Option 1 = 4 loops at bottom
Option 2 = 4 gear loops at front of bottom add 2 gr
Option 3 = option 1 + option 2 = 6 loops in total (2 jointly) add 3 gr
----------------------------------------------------------------------
ALUMINUM hook options and
Option 1 = 4 loops at bottom
Option 2 = 4 gear loops at front of bottom add 2 gr
Option 3 = option 1 + option 2 = 6 loops in total (2 jointly) add 3 gr
 |
| 4 loops at bottom |
 |
| 4 loops at front bottom (Black color, green only for illustration) |
ALUMINUM hook options and
20 mm strap size option at TOP or for SHOULDER strap:
-TOP 20 mm webbing strap with 20 mm plastic buckle in place of default 13 mm hook/strap
-SHOULDER 20 mm webbing strap in place of default 13 mm (comfort)-TOP 13 mm Aluminum hook in place of default 13 mm hook/strap.
- TOP 20 mm Aluminum hook on 20 mm webbing strap size in place of default 13 mm hook/strap
20 mm ALU hook option not compatible with Y top strap option
 |
| TOP Aluminum hook option (13 mm model in picture, 20 mm option possible) |
 |
| TOP 20 mm strap/buckle option add 7gr |
 |
| SHOULDER 20 mm strap webbing option add 12 gr |
----------------------------------------------------------------------
Removable or fix "hand pull loops" :
Hand pull loops are made to insert the thumb to pull and relieve shoulder part.
Size 20 mm.
Add around Fix 10 gr/pair (Removable mean you can put off the loop when no needed) Removable 15gr.
Not compatible with shoulder pocket option.
 |
| Removable are adaptable on every pack with (20-25mm) daisy chain on shoulder straps |
Although it is possible to use the default strap for this, the V strap or Y strap option makes carrying more stable, especially for a BEAR CANISTER.
Not compatible with parallel top strap option
13 mm V strap + hook add around 10 gr (Top maximum length = 2X70 cm+ front hook attach)
20 mm Y strap + buckle add around 20 gr (Top maximum length = 2X70 cm + front 20 cm strap/buckle for easier adjustment). 20 mm option is Not compatible with ALU hook option
20 mm Y strap + buckle add around 20 gr (Top maximum length = 2X70 cm + front 20 cm strap/buckle for easier adjustment). 20 mm option is Not compatible with ALU hook option
I put a tri-glide adjuster to prevent the rest of the strap from dangling, if you find that its use complicates the total operation, you can skip it.
 |
| 13 mm V strap /hook (on KS50) |
_________________________________________________
Lycra mesh (Medium weight) shoulder pocket on shoulder strap:
For smartphone, compact camera, sun glasses, snack etc... or water flask up to 65 mm diameter.
Not compatible with not padded shoulder strap (daypack or Imo pack)
Right pocket opened, left pocket Zipped (when pack is worn) by default or select on PayPal menu:
More pouch here
 |
| Right pocket opened, left pocket Zipped (when pack is worn) |
-----------------------------------------------------
Extension collar option + 10 cm
By default, KS50 or KS60 total length (collar full opened like in PIC) is 80 cm, 75 cm for KS40, 70 cm for KS30 .
To increase collar length for better efficient close (mostly if you have 56 cm torso size for KS30 or 40) or increase volume (bear canister inside for ex) you can add this option:
At the opposite, with a torso 44 cm for a KS40, it is better to skip for a KS50 or KS60 if you want to increase volume than to add a collar extension option.
Weight for a KS 50 = around +14 gr /X21RC fabric, 10 gr /LS07, volume about +5L
Price 1000 JPY
----------------------------------------------------------
Quick trekking pole holder
Usable the pack worn, Add 6 to 12 gr
(Only one side can support 2 poles but consider 2 sides for weight repartition and balance)
-------------------------------------------------------------
UltraStretch bottom mesh pocket:
Available for right hand or left hand access.(Small trash hole at the opposite side corner)
Weight 7 gr , 8, 9 or 11 gr according to bottom size.
Weight for a KS 50 = around +14 gr /X21RC fabric, 10 gr /LS07, volume about +5L
Price 1000 JPY
----------------------------------------------------------
Quick trekking pole holder
Usable the pack worn, Add 6 to 12 gr
(Only one side can support 2 poles but consider 2 sides for weight repartition and balance)
 |
| Left side in this PIC |
UltraStretch bottom mesh pocket:
Available for right hand or left hand access.(Small trash hole at the opposite side corner)
Weight 7 gr , 8, 9 or 11 gr according to bottom size.
(Available for all packs excepted for Alpisack and R-30/50)
 |
| Right hand access in this picture |
Price: 1300 JPY
Rounded pouch (Removable):
Multi usage: for bottle, soft flask or GPS, camera, snack, smartphone etc...
Volume 0, 9 L( 8 cm diameter/ 18 cm)
Top and bottom fixation by two 25 mm clips, strong mesh at bottom.
Weight about 25gr UltraGrid 200, VX07, 200 ultra X.
More pouch here
-------------------------------------------------------------
 |
| NEW design with UltraGrid 200 top stripe when VX07 or Ultra 200 X body, VX07 black top stripe when UltraGrid body |
Removable belt strap (20, 25 or 38mm width size)
in place of fixed padded belt. (Not compatible with frame set option)
The padded part weighs about 35 gr, but we have to extend the strap part and put a loop attach, then I think about 20 gr lighter (depends also on waist size, strap width size).
 |
| 25 mm in picture |
--------------------------------------------------------------------------
NEW Lumbar cushion:
Increase comfort end hip wrap.
Interior padded with 10 mm foam /330D black fabric exterior or 3D MESH, keep the default loop at bottom to allow exterior bungee cord for pad if needed (excepted when 3D mesh for the back back option or padded cordura back option)
Add 16 gr with 25 mm belt, 25 gr with 38 mm belt (85-94 cm range).
Not compatible with sit pad pocket option.
Add 16 gr with 25 mm belt, 25 gr with 38 mm belt (85-94 cm range).
Not compatible with sit pad pocket option.
 |
| 3D MESH finish |
 |
| CORDURA 330D finish fabric |
For Omega packs, 38 mm belt strap is default fit .
You don't need to double take the 38 mm belt strap option if you choose the 38 mm size for KS packs, it will be included:
Additional removable parallel top strap:
an alternative to Y top strap option with more stability,
+ 7 gr for fixed laderlocks, and +16 gr for two removable 13mm/75 cm straps
Not compatible with Y top strap option
