The Buy Note
A daypack is decided by two things: whether the litre number matches the day you actually have, and whether the back panel fits your back. Nearly everything else on the swing tag is detail, and some of it is decoration. This piece is about telling those apart.
What a Litre Actually Holds
Capacity is measured by filling a pack with small plastic balls and then measuring the volume those balls take up, which sounds precise and is not. Makers differ on whether the pockets, the lid and the stretch panel count towards the total, so two packs marked the same size can hold noticeably different amounts. Shape matters as much as volume: a tall narrow pack and a wide flat one of the same capacity swallow different things.
| Capacity | What it suits | The catch |
|---|---|---|
| 10-15 L | A commute, a short walk, a summit push from a base | Fills the moment you add a proper waterproof and lunch |
| 18-25 L | The usual all-day size: layer, food, water, first aid, hat and gloves | Tight in winter, when everything you carry is bulkier |
| 28-35 L | Cold-weather days, hut trips, carrying for a child, a camera and lenses | You will fill it whether or not you need to |
| 35 L and up | Overnight territory, or hauling for other people | Rarely a daypack in practice, whatever the label says |
The instinct to buy one size up is worth resisting. A pack running half empty has slack fabric that lets the load shift and sway, and compression straps only pull the sides in, not the depth.
The Back Panel Does More Than the Badge
Pack fit is set by torso length, not by height. Two people of the same height can be a size apart. Torso length runs from the bony bump at the base of your neck when you tip your head forward down to the top of your hip bones, and it is worth having someone measure it once rather than guessing. Many daypacks come in one length, fine in the middle of the range and poor at either end; where a maker offers two lengths, or an adjustable harness, that is a real feature rather than a marketing one.
Back panels come in three broad forms, and the choice is mostly heat against stability. A frameless panel is light and packable and entirely reliant on you packing sensibly, because whatever you put against your back is what your back feels. A framesheet or perimeter wire gives the pack a shape of its own and spreads the load; this is what most daypacks worth carrying use. Suspended mesh, held off the pack by a frame so air moves behind you, is genuinely cooler, but it pushes the weight further from your spine, which makes a full pack feel heavier and less settled on uneven ground. If you sweat heavily, take the mesh. If you scramble, take the contact and the damp shirt.
Straps are judged by width, by how far apart they sit at the top, and by whether they are cut straight or curved. Curved straps clear the chest and are the reason some packs are sold as women's; the shape does real work regardless of the label. A sternum strap costs almost nothing and stops the shoulder straps sliding outwards, and one that slides on a rail beats a fixed one. Load lifters need an anchor above shoulder height to pull anything at all, so on a small pack whose top edge sits below your shoulders they are two straps doing nothing.
The Hip Belt, and When It Is Dead Weight
Three quite different things are sold under this name. A thin webbing strap holds the pack against you and stops it swinging when you move quickly; it transfers no weight. A padded belt on a frameless pack does a little more, by spreading the pressure of that same job. Only a padded belt attached to a framesheet or stays running down to it moves real weight onto your hips, because the load needs something rigid to travel down.
The belt sits on the shelf of your hip bone, not around your waist. Worn too high it squeezes your stomach and achieves nothing. Worn correctly you can briefly loosen the shoulder straps and the pack stays put. For light loads none of this is necessary, and plenty of people carry a small pack more comfortably with the belt removed.
Water Resistant, Waterproof, and the Gap Between
Almost every pack is water resistant and almost none are waterproof, and the distinction lives in the seams and the zips rather than the fabric.
A coated nylon shell sheds a shower easily. The durable finish outside wears off with use and can be renewed; the coating inside does not last forever either, and a pack stored damp will eventually flake. Meanwhile every stitch is a hole and a standard zip is a long seam with a flap over it. Truly waterproof means welded seams and either a roll-top or a genuinely sealed zip, which is why the packs that manage it look the way they do: fewer pockets, fewer openings, a stiffer feel. That is a trade, not a premium.
For everything else the sensible answer is a liner. A dry bag, or even a heavy plastic bag inside the pack, keeps what must stay dry actually dry and works while you keep walking. A rain cover is a useful addition and a poor sole defence: it leaves the back panel exposed to the water running off your jacket, and it only helps if you fit it before the rain arrives.
Pockets That Earn Their Place
- Side pockets you can reach while wearing the pack. Stretch mesh, angled, deep enough that a bottle does not tip out when you lean. This is the pocket most worth checking in person.
- Hip belt pockets, if the belt is padded. Phone, snack, small camera. On a webbing belt they flap.
- A front stretch panel. Somewhere to shove a wet jacket without putting it inside with everything else.
- One small zipped pocket near the top, with a key clip in it.
- A suspended laptop sleeve, if you commute. Suspended means it hangs clear of the base, so a dropped bag does not land on the corner of the machine.
The ones that mostly are not: a bottom compartment with a zip divider, a sleeping bag feature that arrived on a daypack and costs volume and weight; a hydration sleeve if you do not use a bladder; and an array of small organiser pockets numerous enough that you search three to find one thing. Daisy chains, axe loops and pole attachments are useful to the people who use them and are otherwise a row of loops to snag on branches.
When the Plain Bag Is the Right One
If your walking is a couple of hours on made paths with a jacket and a sandwich, or the pack is mostly moving a laptop across a city, a simple frameless bag will do, and the suspension system is solving a problem you do not have. Technical features exist to make a heavy load bearable a long way over rough ground. Carry a light load a short way and they are inert.
The other case for buying nothing is the pack you already own. People replace a working bag because a newer one has a better back panel, then find the old one was never why the day was uncomfortable. And be wary of buying for the trip you imagine rather than the ones you take. A pack chosen for the winter mountain day you might do next year is the pack you will carry, three-quarters empty, on every ordinary walk between now and then.
