K4 3600 Pack System

Sale Price

Regular Price $675.00
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Hipbelt Size
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Email support@exomtngear.com or call us at 208-995-4688.

Made in the USA  30 Day Free Trial  Lifetime Guarantee

Efficiently designed for those that like to move fast and light.

The K4 3600 is an ideal pack system for ultralight adventures up to 3-4 days.

Total Weight

5lb, 8oz

Total Internal Capacity


Expanded Dimensions

8" x 37" x 10.5"

View All Specifications


Designed for simplicity, versatility, and efficiency.


Built for comfort, performance, and durability.

K4 Frame

  K4 2200 K4 3600 K4 5000 K4 7200
Weight: Bag Only 1lb, 10oz 2lb, 1oz 2lb, 6oz 2lb, 8oz
Weight: Bag + Frame 4lb, 9oz 5lb, 0oz 5lb, 5oz 5lb, 7oz
Weight: Bag + Frame + Lid 5lb, 1oz 5lb, 8oz 5lb, 13oz 5lb, 15oz
Capacity: Bag Only 2,192ci 3,620ci 5,010ci 7,180ci
Capacity: Bag + Lid 2,840ci 4,268ci 5,658ci 7,828ci
Dimensions: Expanded 7" x 25" x 10.5" 8" x 37" x 10.5" 9.5" x 39" x 10.5" 13" x 43" x 10.5"
Dimensions: Compressed 2" x 25" x 10.5" 2.5" x 25" x 10.5" 3" x 25" x 10.5" 3.5" x 25" x 10.5"

Frequently Asked Questions

We do not have dealers or retailers and only sell direct-to-consumer online. (If you are in the Boise area, you can "try and buy" at our shop.)

We do have a 30 Day Trial Period, allowing you to receive the pack, test the fit and function, and make sure the pack is exactly what you need. LEARN MORE

Yes! With 4 frame height options and 5 hipbelt sizes, the K4 Frame included with all of our K4 Packs can fit just about anyone. FIND YOUR SIZE

Absolutely. Our lifetime guarantee covers defects in materials and workmanship for the lifetime of the product, for the original owner. OUR GUARANTEE

We build all of our K4 Packs & Accessories in Boise, ID, USA. We also source US-Made materials whenever possible. MATERIALS & PRODUCTION

We have well over 20 "how to" videos that demonstrate just about everything you may want to know how to do. See all of the How-To Videos for K4 Pack Systems.

As a small company, we pride ourselves on offering personal service, and we would love to help you out.

Everyone on our small team is involved with building, testing, and the use of our products for their personal hunts. WE ARE ALL EXPERTS ON OUR GEAR, AND WE ARE HERE TO HELP.

Give us a call at 208-995-4688 or email support@exomtngear.com and we'd be glad to help with any questions you have.

You can also explore more answers to common questions on our FULL FAQ PAGE.

Real World Reviews

Colton Heward

After 60 days of using and abusing the K4 Prototype last fall, I can confidently say that it is the most comfortable, complete, and capable hunting pack that I have ever owned. It was clearly created for serious hunters, by serious hunters.

- Colton Heward
Paul Servey

The new K4 is the best pack I have used to date. I used a K4 Prototype on 5 big game hunts this past fall and could tell that it was strategically built for comfort and is tough enough to withstand the most extreme hunting and backpacking adventures.

- Paul Servey
Steve Evans

I love the simplicity of the K4! It has everything you need, and nothing you don’t! After testing the K4 Prototype last year, I was thrilled with the new system to detach the bag from the frame. And the new hipbelt design provides a noticeable increase in comfort.

- Steve Evans

Customer Reviews

Based on 72 reviews
Edward Bodnar
Incredible pack and incredible service

I'm a big guy but trying to use rucking and backcountry hunting as a way to lose a lot of weight. I was looking at the Exo Mtn Gear packs to try and decide if they would work for me and contacted the team there about my size and the fit of the packs. They graciously modified the waist belt on the pack I ordered so that it would fit me without using any kind of an extender belt.

I've been using the pack now for some short training hikes and I am pleased to say that this is the most comfortable pack I own and I own quite a few packs. My one and only regret was not purchasing the insulated bottle pouch and riffle carrier when I placed my original order:-)

Thanks guys for making an awesome product that truly fits me and my needs.


This is perhaps the most comfortable pack I’ve ever used.

Worth it

Recently completed a backcountry hunt and while I was packing out, I loved how well the pack sat on my hips. Absolutely worth the money.

Chris Bacon
K4 3600

Great pack! Fit is great and holds enough gear for 3-5 days (depending on how well you pack). I compared this to the other top brands and found the construction, layout and fit superior.

Ray Gonzales
K4 3600

I purchased my k4 3600 in October 2023 shortly after I returned from an elk hunt. Since hunting season was over for me I started doing Ruck hikes , at 64 years of age I started out slowly with 25lbs and have increased to 40 lbs over the past 3 months. Prior to this I owed another well known back pack. Comparing the two I can honestly say this pack this pack feels great, doing a 5 mile 40lb rucks has progressed to a point that I don’t even feel the weight on my back. The pack is easy to adjust, the lumbar par fits perfect on my lower back. Buy it you won’t regret it.