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....

Only load lifter cord option on this default
 X21RC cloud grey KS50
"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 pocke5L (10L in "cargo" option) , made in strong mesh by default (175 gr/m²) or fabric (Fit mesh bottom part to drain water), to store shelter, clothing or other items even wet.

A wide padded belt (KS 40/50) with 8 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 with customer waist size.

Shoulder straps (12 mm X 65 mm width): Since March 2018 new 10 mm foam, more thick for confort and with more density for durability,  covered inside by 2mm 3D mesh, light, strong and very comfortable20 mm daisy chain included on shoulder strap for every packs by default (-7 gr if you want to remove).

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 , 12 loops in total include on the front pocket to allow shock cord lashing.

Top closure by simple and convenient by draw cord and  13 mm webbing strap, which is fixed between the start of the shoulder straps to the front pocket making load lifters effect .

13 mm webbing Sternum strap  adjustable and removable ( +10 gr) .

Every packs fit 2 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:

3 volumes: 30L, 40 L, 50 L
 Note: KS 50 is the most versatile: highly compressible for almost same weight and price.

X-Pac X 21RC cloud grey 149 / m²
is a excellent 210 denier Nylon face fabric, Polyester X-PLY™ at 22° 5 mil shiny polyester film backing, WP, tear resistant and more abrasive resistant than dyneemaX nylon.
   Used by default for KS packs or check and choose other color here: X-pac fabric for body.
Bottom, Shoulder strap, padded waist  side pockets in 330D cordura black fabric is used by default or change are possible by Option here.
Dyneema/ nylon is discontinued for body but still available for bottom, side pockets waist belt and shoulder strap here:option.

Shoulder strap: with new 10 mm foam, more thick for confort and more density for durability (since march 2018). 20 mm daisy chain included on shoulder strap for every packs by default

2 liters bottle in KS 50 pocket in PIC.
Side pockets compact and easily accessible even the pack worn.
Capacity:  for 1 L / KS30, 1,5L / KS 40, 2L for KS 50
All pockets enlarged since January 2018
Fit side shock cord to maintain taller items, up to 3L water pouch for Ex.

Top closure by default: Draw cord/ cord lock (in PIC)
 covered by 13 mm compression strap.
 Default  mesh pocket finish , buckle is replaced by 13 mm hook now
light and unbreakable , see PIC below
(renfort patch color available in KS Packs menu)

Default 13 mm strap and hook clipped on D ring, keep secured even without tension on strap,
stronger than 13 mm buckle for same weight.
(if you prefer buckle, it is still available in 20 mm size option)

Default Bottom and side pockets in cordura 
 to modify: Explanation here.
6 front loops and bungee cord are included by default.
All models allow you to set your sit pad on back using shock cord and default loops
except for 3D mesh back or anatomic belt option, sit pad pocket option, 
no loops at top and low part in those cases.
Finish for fabric front pocket option (same for cargo size option),
 with strong mesh at the bottom to drain water.

5 torso sizes: 44 cm, 47 cm, 50 cm, 53 cm, 56 cm 
Mesure your back (torso size) like this:
and measure your usual backpack to be sure, bottom of the pack up to start of shoulder strap.
 By default: for 1m62 ---> 44 cm 1 m 68---> 47 cm, 1m74--> 50 cm, 1m80-->53cm, 1m86-->56 cm (For Asiatic people, add 3 cm for this method)
Intersect the result of 3 methods to be sure.
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 30
Volume total : 25L (30 L extended collar open, 23 L body +5 L front pocket +1+1L side pocket), 
Estimate weight (without accessories): 340 gr  X-Pac,
Recommend total loads up to  12 kg
Maximum pack collar length = 70 cm, if you wear 53 cm or 56 cm torso size, consider 10 cm extension collar option bellow.
KS 40
Volume total : 35L (40 L extended collar open, 32 L body +5 L front pocket +1,5+1,5L side pocket), 
Estimate weight (without accessories): 360 gr  X-Pac X21RC
Recommend total loads up to  12 kg
 (SUL version of KS 4 here)

KS 50
Volume total 45 L (50 L extended collar open 41+5+2+2), 
Recommend total loads up to 12 kg.
Estimated weight (without accessories) :  380 gr x-pac X21RC

 X-Pac: X 21RC cloud grey by default or check and choose other fabrics here:

 Choose your usual pants size for Belt size

sizes and fabric
Torso Sizes
Belt size
Front mesh fabric patch color

Ice Axes Loops (can be used for trekking pole):
Fit 1 elastic cord and 1 cord lock/hook by loop, add 5 gr for one.
New cord lock hook

Right side in this PIC


Ice Axe Loops


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, 30gr VX07, 35 gr VX21


Redesigned March 2018

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

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 19cm x 20cm) made of nylon ripstop 70 D black, mini velcro, gr
Removable for UL satchel use fit hook and round cord= 18 gr

REMOVABLE for satchel use
Internal pocket
Large belt option 38 mm with dual Adjust Side Release Buckle (in place of 25 mm default) add 14 gr in 85-94 cm belt size range:

Large belt 38 mm
20 mm removable  (height adjustable) air sternum strap with whistle, weight 18 gr but add only 8gr from standard default 13 mm sternum strap.

Price: 550 JPY

Dry bag top closure system
Velcro and 13 mm buckle:
Add around 10gr
(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:
(add around 15gr acc to fabric)
Made of 3D mesh add 24 gr

Made with your pack fabric.
  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 5L same weight:
(Not compatible with cargo size option 10L)

Zipped front pocket option:
Internal pad pocket 
(rectangular ) Usable Width = 24 cm, length according to your torso size:
Using with removable pad, make the back of the pack more comfortable and more rigid.
Weight pocket around 15 gr
 Pad in option, shaped according to your back size in white PE foam 8 mm.
Weight around 22 gr

Internal pad pocket
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, the 20 mm webbing strap is more durable.
20 mm webbing
Linelock + cord 

Anatomic padded hip belt with 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
Anatomic padded belt
Standard 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.

Mesh (or fabric) pocket pair on side of the pack:
Strong mesh
 add around 30 gr in strong mesh or fabric.

Mesh pocket pair
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 (tube) + 10 gr for fixed loops. Associate with 38 mm waist strap/buckle option is recommended. 
Associate with load lifter strap or cord option is also recommended.
(Space between shoulder and tube enlarged since March 2018)
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 the back of the structure.  

                                                                       Frame set video

Price: 3800 JPY
Cargo front pocket
Twice bigger than standard = 10 L. Add 20 gr
(Available also for Alpisack, bungee cord in option in this case ):

By default fit strong mesh at the bottom of pocket to drain water for fabric finish.
Dyneema fabric option in  PIC

Fabric/ pack model
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: dyneema or X-pac fabric

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 gear loops at front of bottom (Elastic not included)

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

20 mm shoulder strap webbing option add 12 gr


 Removable or fix "hand pull" :

Hand pull loops are made to insert your the thumb on the loop 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.
Removable hand pull.


20 mm Y shaped top closure strap:
Useful if you planned to carry big item like bear canister, in other cases, standard close by 13 mm or 20 mm strap is enough efficient even for rolled pad.
Add around 20 gr 
(Associate with the front pocket custom form option is recommended to dissociate pocket and strap)
20 mm strap

Price: 1400 JPY


Lycra mesh shoulder pocket pair on shoulder strap Add 18 gr /pair (Not removable)
NEW, Right pocket opened, left pocket Zipped:
For smartphone (even big), compact camera, sun glasses or snack, not for water bottle. (Not compatible with hand pull loops option):

Price/pair: 2900 JPY

Extension collar option  + 10 cm
By default, KS 50 total length (collar full opened) is 80 cm, 75 cm for KS 40, 70 cm for KS3 .
To increase collar length for better efficient close (mostly if you have 56 cm torso size) or increase volume (bear canister inside for ex) you can add this option:
Weight for a KS 50 = around +17 gr (X21RC fabric), 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,
Weight 22 gr

Price 2000 JPY