Frameless, hipbeltless construction enables unrestricted movement for ultralight hikers
Lightweight build reduces fatigue during long treks
External side pockets provide organized storage for essentials
Stretchable front pocket accommodates additional gear as needed
Durable nylon shell offers reliable protection on rugged terrain
Summarized by Shop
On the trail, it's not just about what you pack, it's about what you choose to leave behind. Meet The Atom, a thoughtfully crafted pack for the ultralight hiker.
The Atom embodies the essence of less - hipbeltless, frameless, effortless. Tailored for those craving to go further, faster, it's your go-to for ultralight thru-hikes. No frills
Load Capacity
9 kg (20 lbs)
Maximum Pack Weight
416 g (15 oz) / 428 g (15 oz) / 453 g (16 oz) depending on model
Main Body Volume
25 L / 35 L (model dependent)
Side Pockets Volume
2 x 2.5 L
Front Pocket
Stretchable, up to 5 L additional capacity
Height (fully unrolled)
68 cm / 77.5 cm (model dependent)
Circumference at Base
76 cm / 79 cm (model dependent)
Circumference at Top
84 cm / 86 cm (model dependent)
Summarized by Shop
4.5
4 ratings
5
4
3
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1
The perfect weekender
Unbelievably comfortable when packed correctly. The Atom RE40 has become my new favourite pack, replacing my old Zpacks Arc Haul. Build quality is best in business. If I am carrying under 9kg, the RE40 just cannot be beaten. Shoulder straps are fantastic too. This is my third Atom Packs pack. I have tried many brands, but keep coming back to Atom.
T
The · June 11, 2026
Good backpack , poor hip strap fitting
Backpack itself is very good- I am very happy with it , the problem is a hip strap, I bought this separately and I am very very disappointed. Whoever’s idea was the hip strap fitting to the backpack should think again, the fitting is awful !! The hip strap falls off the backpack every 10-20 min, it is so annoying to stop walking and fix this . I understand you try to make money but common. The strap should be attached to the backpack permanently.