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Beast18 Ultralight Technical Backpack

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The Beast18 is an ultralight packable frame pack engineered for technical outdoor pursuits.
Best For: Long distance carry and trails
18 liter capacity
Hydration compatible
Includes compression storage sack for travel
Qualifies for free shipping (USA)

- 18 liter capacity
- Flexible frame that moves with your body
- Removable hip belt
- Sternum strap, detachable
- Wrap around zipper on main compartment
- Hydration compatible
- Gear loops for hiking poles or ice axes
- Hypalon™ reinforced external daisy chain
- Water bottle pockets
- Two internal pockets and key loop for securing small items
- Padded, breathable mesh shoulder straps and back panel
- Compression storage sack for travel

Volume: 18 liters
Weight: 1lb 5oz (595g)
Unpacked Dimensions: 20 H x 10 W x 6.5 D in
(50.8 H x 25.5 W x 16.5 D cm)
Packed Dimensions: 9 H x 9 W x 3.5 D in
(22.9 H x 22.9 W x 8.9 D cm)

- 210D Robic® high tenacity nylon, UTS coated, DWR finish
- 100D nylon, PU coated, DWR finish
- YKK® zippers and hardware
- EVA foam padded back, shoulder straps, and hip belt
- 210D nylon bonded thread with bartack reinforced construction

Coating Specs
- UTS coating (ultra tear strength): waterproofing and tear strength increase of 30%
- PU coating: waterproofing

Are Beast Series Packs waterproof?
Beast packs are built from waterproof materials and can withstand intermittent or light rain. For more waterproofing, we suggest the Advanced Series.

What kind of frame does the Beast Series have?
Beast Series Packs feature a stainless hoop frame that disperses weight from the shoulders to the hip belt. The frame is rigid vertically, but twists right to left to move with your body if your navigating rough terrain or scrambling.

Does this pack have a hip belt?
Yes, the hip belt is removeable.

What is the difference between the Beast18 and Beast28?
The Beast18 is 18 liters. The Beast28 is 28 liters and additionally has zipper pockets on the hip belt. The hip belts are interchangeable.

How does this backpack stow for travel?
The flexible frame allows you to twist and fold the pack into the included storage bag. For detailed instructions, the demo video shows this process step by step.

Is the Beast hydration compatible?
Yes. The Beast has a hydration reservior pocket, hangers, hose exit, and house routing features.

Will the Beast fit a laptop?
The Beast will fit up to 14" laptop and tablets

Will the Beast side pockets fit large water bottles?
Yes. The side pockets easily fit large water bottles, even Nalgene bottles and 1 liter bottles.

Does this bag have a warranty?
Yes, this product is warrantied for 3 years. Bags in and out of warranty are eligible for repairs.

Warning: This product can expose you to chemicals including DMF which is known to the State of California to cause cancer. For more information go to

Back view of woman on gray background wearing Beast18 with trekking poles and ice axe attached

Fully featured technical pack

Ultralight frame pack featuring hydration sleeve, gear loops for alpine tools, and daisy chains for additional external storage. 1lb 5oz total weight, and built with Robic nylon and rugged YKK hardware.

Twisted Beast18 backpack on light gray background

Flex comfort

Built-in steel frame suspension system moves with the body during activity. Adjustable hip belt and sternum strap distributes heavy loads evenly.

Hands cinching Beast18 into compression sack


To pack, twist and fold the pack in half and secure in the included compression sack. To unpack, remove from compression sack and the spring steel frame instantly restores the shape of the pack.

Spring steel frame on black background

Flexible frame suspension

The Beast18 features an innovative spring steel frame, which allows for both structure and packability. The flexible frame suspension provides comfort and torsion with movement, for an agile fit that moves with you and distributes loads evenly. When not in use, simply twist and fold the frame, and secure into the compression sack. The spring steel frame bounces back into its original shape when released.

Man on black background holding beast18 pack open

Organization on the trail

The main compartment features an asymmetrical clamshell zipper, making it easy to access the larger items at the bottom of your pack. An oversized front compartment extends to the bottom of the pack, while a zippered pocket inside protects your smaller items. Safely store valuable items in the small interior pocket with keyloop.

Man placing hydration bladder into beast18 backpack

Hydration compatible

An internal hydration sleeve accommodates most 1-3 liter reservoirs, with hose routing features on both shoulder straps for a customized fit.

Hands cinching Beast18 into compression sack

Stow for transit

Easily twist, fold, and store the pack in the included compression sack for travel. Ultralight at just 1lb 5oz, the Beast18 makes it easy to take a fully capable alpine pack with you wherever you go.

"Very lightweight"

I needed a better packable backpack to bring with me on my multi-day mountaineering trips and this is exactly what I was looking for. It fits great inside my main pack and it's very lightweight for a backpack that has a frame.

- Will (verified customer)

"Best backpack I own"

This pack comes with me on every trip. It's comfortable for long periods of time and has all the features I'd need. I've worn it hiking, climbing, mountain biking, and it's been just what I've needed each time.

- Steve (verified customer)