KS packs

Lightweight and durable backpacks from a simple and rational building.

Concept: minimal accessories well placed for maximum efficiency!

Main application: Ultralight hiking, ultralight trekking....
(Best profit, benefice, for base gear list up to 4 kg)
200D Nylon Diamond spectra ripstop finish, Bottom, side pockets, waist and
 shoulder strap are made of black cordura 330D by default.

Only load lifter cord option on this (Cloud grey) KS50 pack,
default front pocket have now this design.
"Frame set" is optional 

KS packs series Fit:

Innovative fabrics, the weight / resistance ratio optimized for safe and sustainable using.

A large main tube simple and convenient to use.

 A large front pocket 8L (June 2020), made in duty nylon mesh by default (160 gr/m²) UV resistant, or fabric for color and opacity  in option (Fit mesh bottom part to drain water), to store shelter, clothing or other items even wet.

Shoulder straps (12 mm X 65 mm width): 10 mm high quality foam (since March 2018), covered inside by 2mm of 3D mesh, light, strong and very comfortable20 mm daisy chain included on shoulder strap up to load lifter start location for every packs by default.

A wide padded belt (KS 40/50) with 10 mm foam 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(if you want them taller by custom please note it means you must remove the pack to take the bottle) closer to the hips and lower back, ensuring comfort and balance. (drainage holes at corner bottom)
Side pockets enlarged since January 2018

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  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 secure your pole using loops etc...

6 bottom additional loops in option.

2 removable waist pockets  for all models in option.

"Frame set" is optional 

Available in:

4 volumes: 28L, 38 L, 48 L, 58L
All KS packs are highly compressible, when hesitate, skip to a superior size for versatility may be suitable.

Fabrics (more explanation here): 

VX07 SOFT (Light version 145 gr/m2) Black, silver grey or new Red :70 Nylon Ripstop face fabric treated with a DWR(durable water reppelent) finish. Waterproof PU and polyester layer,  840D Polyester X Ply,  50 D Polyester Taffeta backing fabric.
Best ratio weight performance for SUL/UL pack.

Nylon 200D Spectra diamond ripstop (145 gr/m2) same finish but 10% lighter than formerly named nylon Dyneema X, very tear resistantavailable for pack body, bottom, waist, shoulder strap, pocket option etc.. water repellent.
 Best ratio weight performance for UL pack.

X21RC Cloud grey(149gr/m2)  210 denier Nylon face Black Polyester X-PLY® at 22°.5 mil shiny polyester film backing.DWR finish. Best ratio weight performance for UL pack.

 VX 07 (180 gr/m2) for colors choice Add 20 gr to the pack
38% Nylon 62% Polyester 70 denier double rip-stop Nylon face Black Polyester X-PLY™ at 22°  0.25 mil PET film 50 denier polyester taffeta backing. DWR

 VX 21 soft Brown 170gr to 220 gr/m2 firm) a little bit heavier than other but very good strength, abrasive resistant and DWR. Color available. Add +30 to 60 gr  from 200D 
For bottom, Shoulder strap, padded waist and side pockets, 330D cordura black fabric is used by default, change are possible by Option here.
 Nylon Spectra is also available for bottom, side pockets waist belt and shoulder strap here:option.

2 liters bottle in KS 50 pocket in PIC.
Side pockets compact and easily accessible even the pack worn.
Bottle size you can put inside one side pocket
1 L / KS30, 1,5L / KS 40, 2L for KS 50 or 2 X 1 liter"smart bottle " 7,5 cm diameter)
All pockets enlarged since January 2018
Fit side shock cord to maintain taller items, up to 3L water pouch for Ex.

Drawstring top closure by default: Draw cord/ cord lock (in PIC)
 covered by 13 mm compression strap.
Reinforcement patch color available in KS Packs menu only for default front mesh pocket

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)

NEW 8L default front pocket with
front loops for bungee cord included (June 2020).
Default Bottom and side pockets in cordura 
 to modify: Explanation here.
Fabric front pocket option finish:
 with strong mesh at the bottom to drain water.

Included loops allow to use your pad on back
(Not compatible with anatomic belt, 3D mesh back option, no top and bottom loops in this case)
5 torso sizes: 44 cm, 47 cm, 50 cm, 53 cm, 56 cm 
1) Measure your back (torso size) like this (up to C7, not trapezius) and  add 3 CM 
2) And measure your usual backpack to be surebottom of the pack up to start of shoulder strap (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)
Intersect the result of 3 methods to be sure.

Measure Belt hip size at larger part of ilium 

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.

Approximative size, the pack rounded by its content, (not bottom or side size)
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  X-Pac X21RC or 200D Nylon/spectra. 
 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): 370 gr  X-Pac X21RC or 200D Nylon/spectra. 
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) :  390 gr x-pac X21RC or 200D Nylon/spectra
New 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) :  410 gr x-pac X21RC or 200D Nylon/spectra.

                              Measure Belt hip size at larger part of ilium             
VX07 Black, Red, Silver grey are soft version
VX21 BROWN  is out of stock with no restock date.

KS Packs order:
Torso size
Hip size
Pack body fabric
Renfort Patch color on front pocket if mesh
Front pocket fabric options if not default nylon mesh Cordura add 10 gr, VX07 soft,  200D nylon save 5 gr, other X-pac add a little, LS07 not recommended.

Nylon/Spectra fabric + 20 mm top strap/buckle option in PIC.
By default fit strong mesh at the bottom of pocket to drain water when fabric finish.

Color if X-pac
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 are 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: 

Size: 5X19X12/9 cm with waterproof zip and 1 key holder hook inside (one/pair).
Weight around:  24 gr LS07,  28 gr X21RC or Spectra, 30gr VX07, 35 gr VX21
Redesigned March 2018
(Left side means left hand when pack wear)

Localisation (if single pocket)
Fabric color
Hole for hydration pipe (with inside hook) and water pouch pocket  options for 35 cm X 17 cm X 7cm size water pouch.
(This pocket is compatible with internal pad pocket option but not with internal pocket option.) Add 3 gr or 20 gr

Placed at center, allow right or left pipe way out.

Water pouch + hook

H2o Options
Back in mesh 3D add 60gr approx.
Padded with not removable 8mm foam pad add 85 gr in total.

Back in 3D mesh (2 mm)
Back in 3D mesh padded with not removable 8mm foam. (total=10 mm)

3D spacer mesh option
Internal pocket fixed or removable:
(around 20cm x 21cm) made of nylon ripstop 70 D black, mini velcro, FIXED: gr
REMOVABLE for UL satchel use fit hook and round cord: 17 gr

REMOVABLE for satchel use

Internal pocket
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:

Large belt 38 mm
20 mm removable  (height adjustable by slip on webbing) air sternum strap with whistle, 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.

Price: 550 JPY

Dry bag type top closure system:

Closed by velcro (Omni tape named) with soft touch, not aggressive for skin and almost no stitch on other fabrics.
Or by snaps (New)
Top 15 mm buckle:
By Snaps
Add around
12 gr or 6 gr
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) 

Dry bag top closure system
Sit Pad pockets pair:
200D nylon/ spectra for add  16gr cordura 330D 18 gr 3D mesh add 24 gr

Made of 3D mesh add 24 gr

  Sit pad are sold below

Sit Pad pockets
Sit pad size around 25 x 50cm (rectangular since March 2018) according to your back length size, in durable ( Made in Japan) PE foam, 10 mm, color grey.
weight around 35 gr (torso 53 cm)
Full rolled pad in sale here
Price 1000 JPY
Zipped front pocket option 8L(enlarged June 2020) same weight:

Zipped front pocket option:
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 + 6 gr
 10 mm Pad in option, shaped and weight according to your back size + 40 gr.

picture show the pack reversed, inside out

Load lifter strap :

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)
Should be made from lineloc and rigid cord for UL pack .
Cord add 9 gr , 20 mm 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 
Anatomic padded hip belt with side load lifter strap :
 For better load transfer on the hips, mostly slim people (Only waist 70 cm up to 84 cm) included 38mm webbing and buckle option, add around 40 gr.

Waist size (choose the same than for your pants)
Price: 2200 JPY
Standard padded belt
Anatomic padded belt
 Not compatible with the Sit Pad pockets option but compatible with the Internal pad pocket option  Fabric : Black 330D by default.
Also compatible with the frame set option and side removable waist pockets.

Upper side pockets pair 
They are quite flat to not  interfere with the pockets below, you can also use the side cord to prevent content from sliding down:
Strong mesh
 Pair add around 25 gr in strong mesh or fabric.
Fabric with 500 ml bottle
 (Fit hole at low corner to drain water)

Removable Frame se:
A good UL alternative if you don't use your rolled pad to create a frame in your backpack  and to optimize load transfer on hips .
 Easily removable (10 sec) frame aluminium 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. 
New: you can order the system without tube and use yours: Carbon pole, DIY etc...tube length =your torso size + about 20 mm diameter 8 or 9 mm. I suggest to place tape at extremity of the tube to prevent abrasion and increase diameter to secure all without space.
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.  
Because of pandemic, the price differ according to country destination (shipping fee)

                                                  Effective load report on hip showed in "Frame set video"

Because of pandemic, the price differ according to country destination (Shipping fee)

Frame set attach with
Custom front pocket form with fabric stripe at top and separate top closure with triangle reinforcement patch (Top strap is not fixed directly on pocket like standard fitting but dissociate)
Available for standard mesh pocket and fabric pocket.
Stripe material: 200D N/Spectra or X-pac fabric
(No significant weight gain)
200D N/spectra top stripe

Red X-pac top stripe

Price: 1000 JPY

Top stripe fabric:
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 

4 loops at bottom
4 loops at front bottom (Black color, green only for illustration)

Loops options
Strap size option:
20 mm width in place of standard 13 mm for shoulder strap webbing (more comfort) and top closure webbing (Buckle in place of hook)
20 mm top closure strap webbing option add  7gr

20 mm shoulder 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. (The 20 mm daisy chain are now included by default)
Add around Fix 10 gr/pair (Removable mean you can put off the loop when no needed) Removable  15gr.
Not compatible with Lycra mesh pocket option
Removable hand pull.


 Y shaped top closure strap:
Useful if you planned to carry big item like bear canister (some people use the default strap), in other cases, standard close by 13 mm or 20 mm strap is enough efficient even for a rolled pad.
13 mm + hook add around 10 gr  (Top maximum length = 2X70 cm+ front hook attach)
20 mm + buckle add around 20 gr (Top maximum length = 2X70 cm + front 20 cm strap/buckle)
(Associate with the front pocket custom form option is recommended to dissociate pocket and strap and prevent slipping items .
20 mm strap


Lycra mesh shoulder pocket on shoulder strap:
For smartphone, compact camera, sun glasses or snack, not for water bottle. (Not compatible with hand pull loops option): 
Add 30 gr /pair (Not removable)
 Now heavy mesh for high durability (May 2019)
 Right pocket opened, left pocket Zipped by default or select on PayPal menu:

Lycra mesh shoulder pouch

If single, position:
Extension collar option + 10 cm
By default, KS 50 total length (collar full opened like in PIC) is 80 cm, 75 cm for KS 40, 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 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

"JOKER HAT " top closure option:
"Joker hat top closure"= dry bag type top closure combined with load lifter strap attach on shoulder strap (see picture), possibility to close like a simple dry bag, 20 mm strap and buckle
(Fit New velcro (Dec 2018) with soft touch, not agressive for skin and witch almost no stitch on other fabrics)Weight 22 gr   The backpack don't turn waterproof with this option.

Price 2000 JPY
Bottom heavy lycra mesh pocket:
Available for right hand or left hand access.(Small trash hole at the opposite side corner)
Weight 14 gr , 16, 18 or 22 gr  according to bottom size.

Right hand open side

Open side
 Rounded pouch (Removable):
  Multi usage: for bottle, soft flask or GPS, camera, snack, smartphone etc...
Volume 0, 6 L( 7cm diameter/ 17 cm)
Top and bottom fixation by two 25 mm clips, strong mesh at bottom.
Weight from 18gr (LS07)/ 200D and Soft VX07: 20 gr
0,5 L Bottle and 0,6L soft flask in sale here

Rounded pouch
Vertical stripe color
Removable belt strap (20, 25 or 38mm width size)
in place of fixed padded belt. (Not compatible with frame set option)
25 mm in picture


XL shoulder straps (+ 6 cm length)
Could be considered if your chest is over 110 cm circumference, and/or for a very long torso, if you planned to place a very thick pad in your back, for comfort. Anyway, please check your current pack for comparison using this sketch scale:
Weight +24 gr/pair

XL shoulder strap