Best for Ultralight
Frameless Backpack (e.g. Zpacks Arc series)
$325–$450
Weight10-16oz — dramatically lighter
Capacity30-50L typical
Load transferMinimal — weight rides on shoulders
Comfort thresholdBest under 20lb total pack weight
PackingRequires deliberate technique — sleeping pad as frame
Best for Traditional Backpacking
Framed Backpack (e.g. Osprey Atmos 65)
$270–$350
Weight3.5-5lb — significantly heavier
Capacity50-75L typical
Load transferHip belt transfers 70-80% of weight to hips
Comfort thresholdHandles 30-50lb comfortably
PackingLoad lifters work with irregular packing
Bottom line: Load transfer to hips is the reason backpacks have frames. Carrying 30+ pounds on your shoulders for 10 miles is miserable. Frameless packs become comfortable only when total pack weight is under 20 pounds — a threshold requiring serious ultralight discipline. Until you are there: buy the framed pack.
Head-to-head: key differences
Weight
Arc10-16oz pack weight — 2-4 lbs lighter
Atmos3.5-5lb pack weight — heavier but more comfortable with loads
Frameless wins on pack weight alone.
Load transfer
ArcWeight stays on shoulders — uncomfortable over ~20lb
AtmosHip belt transfers majority of load — comfortable to 50lb
Framed pack wins significantly for most hikers.
Packing discipline
ArcSleeping pad must serve as frame — requires deliberate loading
AtmosForgiving — pack in any order
Framed pack wins on ease of packing.
Price
Arc$325-450 for quality frameless
Atmos$270-350 — similar or less expensive
Framed pack often wins on price too.
Choose Frameless Backpack if:
- →Your total pack weight is consistently under 20lb (base + food + water)
- →You have invested in ultralight gear across your whole kit
- →Long-distance hiking where every ounce compounds over hundreds of miles
Choose Framed Backpack if:
- →Any pack weight over 20lb
- →You are new to backpacking and not yet ultralight
- →Car camping crossover where you pack extra comfort items
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Common Questions
What pack weight should I target for frameless?
Under 20lb total (including food and water). Ideally under 15lb. Frameless packs worn by serious ultralight hikers typically carry 8-12lb base weights. If your base weight is over 15lb, a frameless pack will be uncomfortable.
Can beginners use frameless backpacks?
Technically yes, but not recommended. Frameless packs require deliberate packing technique and a disciplined ultralight gear selection. Beginners benefit from framed packs that are comfortable even with less-than-perfect gear selection.
What is a good base weight for backpacking?
Traditional: 25-35lb total. Lightweight: 15-25lb. Ultralight: under 15lb. Base weight (without food, water, or fuel) targets: lightweight = under 15lb, ultralight = under 10lb. The frameless sweet spot requires sub-10lb base weight.