A frameless backpack has no rigid frame to transfer weight to your hips, so comfort depends on how you pack it: the load must form a firm, even shape that sits close to your back and does not shift as you walk. When packed well, a frameless pack can carry 20 to 25 pounds comfortably for long days, and many ultralight hikers prefer the simplicity and weight saving. When packed badly, the same pack sags, pulls on your shoulders, and feels twice as heavy, which is why packing technique matters more than brand.

Start by creating a solid core: a sleeping pad, either folded flat against the back panel or rolled as a cylinder inside the pack, gives the pack its shape and stops soft gear from bulging. Closed-cell foam pads work especially well for this, because they hold their shape and add a little padding against your back. If you use an inflatable pad, pack it in a stuff sack and place it so it fills the back panel evenly, then build the rest of the load around it.

Pack heavy, dense items close to your back and roughly at shoulder-blade height, which keeps the centre of gravity near your body and stops the pack from pulling you backwards. Food bags and water reservoirs belong in this zone, while lighter, bulkier items like your quilt and clothing fill the top and bottom. Avoid packing a heavy item at the very top or bottom, because both positions make the pack swing and strain your shoulders on uneven ground.

Use the pack's volume fully but evenly, filling gaps with soft items so nothing shifts when you move. Stuff sacks help organise gear, but over-compressing everything into hard balls creates pressure points, so let soft items like clothing fill the spaces between firmer items. Keep items you need during the day, such as rain gear, snacks, water treatment, and sunscreen, in outside pockets or near the top, so you are not unpacking the whole bag at every stop.

Fit adjustments on a frameless pack are simpler than on a framed pack, but they still matter. Set the hip belt so it sits on your hip bones and takes a share of the load, then tighten the shoulder straps until the pack rides snugly without cutting in. Load-lifter straps, where fitted, should pull the top of the pack gently towards your shoulders, not yank it tight, and a sternum strap stops the shoulder straps sliding off on steep or uneven ground. Re-adjust after the first hour, because straps settle as you walk.

Weight discipline is part of comfort with a frameless pack, because there is a practical limit to what a soft pack can carry well. Most hikers find the comfort zone ends somewhere around 25 to 30 pounds total, including food and water, and beyond that a framed pack is usually more comfortable despite its extra weight. If your total regularly exceeds that range, either trim your gear or accept a light frame, because forcing a frameless pack to carry a heavy load will cost you more in fatigue than the frame weighs.

Finally, test your packing on a training hike with a realistic load before a long trip, and pay attention to where soreness appears. Shoulder pain usually means too much weight is on your shoulders, so tighten the hip belt and move heavy items closer to your back. Lower back pain often means the load is sagging, so repack with a firmer core. Small adjustments, practised until they are habit, are what turn a frameless pack from a weight-saving experiment into a comfortable daily companion.