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Dry Bag for Wild Camping: Packing and Sizing Guide

What wild camping changes about waterproof packing

Wild camping removes every fallback that makes casual waterproof packing work. There is no vehicle to return to, no drying room, no shop and no chance of borrowing a dry layer from someone else. Everything you carry has to stay dry for the whole trip using only what is on your back, which turns waterproofing from a comfort feature into a safety feature.

The exposure is also continuous rather than episodic. A day paddle gets you wet for an hour and then you are back at the car; a two-night wild camp in unsettled weather keeps you damp for forty hours, with the tent, the ground and the air all saturated. Fabrics that dry overnight at home simply do not dry, so the bag has to prevent wetting rather than mitigate it.

That shifts the specification. Film thickness moves up because a bag gets dragged over rock and set down on wet ground every day; closures move up because you open them with cold hands in the dark; and colour matters because you are identifying bags by head torch at 10 pm. A 0.4 mm film with a reinforced mouth is the practical floor for this use, and 0.5 mm is better on a trip over three nights.

Capacity maths per person per night

Work from the sleep system outward, because that is the one item that cannot get wet and cannot be compressed below its loft volume. A three-season synthetic bag packs to 8 to 11 litres and a 700-fill down bag packs to 5 to 7 litres; add a sleeping mat at 3 to 6 litres, and the sleep block alone is 11 to 17 litres before clothing.

Clothing is the next block and it grows with the season. A summer two-night list of base layer, insulation, shell, spare socks and a hat packs to 7 to 9 litres; the same list in shoulder season with a fleece and a second pair of trousers reaches 11 to 14 litres. Food and cooking add 5 to 8 litres for two nights, and the remaining 3 to 5 litres covers water treatment, first aid, electronics and documents.

Two patterns are worth noting from that table. The dry bag share of total volume runs at 60 to 70%, which is higher than for any paddling or beach use, because there is nowhere to leave anything dry. And the fourth bag appears only above two nights, because by then food volume has grown enough to need its own container for smell and for organisation.

The four-bag system for a remote camp

Assign one job per bag and keep the assignment for the whole trip. Bag one is sleep: sleeping bag, mat and pillow, packed first and opened last. Bag two is clothing: everything you wear in camp and everything you change into. Bag three is food and cooking: stove, fuel, pot, food and a rubbish bag. Bag four is small and precious: phone, map, head torch, first aid, documents.

The order in which you open them is the point. On arrival you need the sleep bag and the clothing bag immediately, and you need them before dark. Food comes after the tent is up. The precious bag should not need opening at all except to retrieve a head torch, so it belongs at the top of the pack rather than buried at the bottom.

Colour or size coding replaces labels here. In the dark, by torch light, three black bags of similar size are indistinguishable and you will open all three to find the stove. Give the food bag a distinct colour, make the sleep bag clearly the largest, and keep the small pouch in a jacket pocket rather than in the pack at all.

Sleep system: compression and the 8L question

A sleeping bag is the volume that decides everything else, and compression is where people get it wrong. A compression dry bag with four straps will take a 10 litre synthetic bag down to about 7 litres, but squeezing below that damages loft over repeated trips and, more importantly, makes the bag too stiff to pack into the bottom of a rucksack comfortably.

Leave 15% headroom in the sleep bag. A compression sack packed to exactly its stated capacity will not close after three days, because down and synthetic fill both lose loft slightly when compressed for long periods and the closure needs room to fold. A 12L bag for a 10 litre load is correct; a 10L bag for a 10 litre load is a fight every morning.

The mat is the item people forget to protect. A punctured inflatable mat is a cold night and a ruined trip, and it is usually punctured in transit rather than in the tent. Pack it in its own 8L bag, not loose against the cook pot, and keep it away from the stove and the fuel bottle. Our sleeping bag sizing guide covers the volumes in more detail.

Clothing and the wet and dry rule

The rule for clothing on a wild camp is absolute separation: what is dry stays dry, and anything that has been wet never shares a bag with anything that has not. That sounds obvious and is routinely broken on the second day, when a damp shell gets stuffed into the clothing bag because there is nowhere else to put it. By the third morning every layer in the bag is damp.

Carry a dedicated wet bag for this, and make it small. A 5L bag hung outside the pack or strapped to the top holds a wet shell, wet socks and a wet buff without contaminating anything else, and it can hang from a tree or a tent pole to dry during a break. It is the cheapest 90 g you will spend on comfort across a multi-day trip.

Merino and synthetic base layers tolerate being packed damp for a day; cotton does not, and down does not. If your insulation is down, the clothing bag containing it should be the most reliably sealed bag you own, because damp down loses loft and does not recover until it is properly dried. That is the single strongest argument for a welded TPU bag rather than a coated one on a long trip.

Food, cooking and smell control

Food needs its own bag for three reasons: smell, spillage and organisation. Sealed TPU is effectively odour-proof for the short term, which matters in any area with rodents or larger animals; a welded bag contains a leaking fuel bottle or a burst sauce sachet; and one dedicated bag means the stove is always in the same place.

Volume is the surprise. Two nights of food for one person, at roughly 600 g of dry food per day plus a stove, a 230 g gas canister and a 700 ml pot, packs to 5 to 7 litres and weighs 2.2 to 2.8 kg. That is heavier than the sleep system on a summer trip and it is why the food bag should be sized generously rather than exactly.

Rubbish is part of the food bag. A wild camp has no bins, and everything you carry in comes out with you, including used toilet paper and food wrappers. Pack a small roll-top or a sealed pouch specifically for waste and treat it as a full bag on the way out, because a leaking rubbish bag inside a food bag is the worst smell a pack can develop.

Weight budget and where a dry bag earns its grams

On a wild camp every gram is argued for, and dry bags have to justify themselves against a simpler alternative: a pack liner. A single 0.4 mm TPU liner inside a 55L pack weighs 180 g and waterproofs the entire load for one closure operation. Four separate roll-top bags with compression and harness points weigh 340 to 480 g for the same volume.

The liner wins on weight and loses on organisation, access and redundancy. With one liner, everything is in one cavity and finding the stove means unpacking the tent; a leak in the liner wets everything you own. The four-bag system costs 200 to 300 g and buys compartmentalisation, a second line of defence, and the ability to hand one bag to someone else. For a solo two-night trip the liner is defensible; for anything longer, or for two people, the bags win.

A hybrid is the usual answer: one liner for the whole pack plus two internal bags for the sleep system and the electronics. That comes to about 300 g, gives redundancy where it matters most, and keeps the pack shape stable. Our liner versus dry bag comparison sets out the trade-offs with numbers.

Condensation inside a sealed bag

A sealed dry bag does not breathe, so moisture inside it has nowhere to go. That moisture comes from three sources: damp kit packed by mistake, sweat evaporating from worn clothing, and the air trapped when you rolled the bag closed on a humid morning. Over two nights it can add 20 to 40 g of water to a clothing bag, which is enough to make a base layer feel clammy.

The controls are simple. Pack everything genuinely dry, press as much air out as you can before the first fold, and open each bag for ten minutes in the sun at a midday break. Do not pack a worn wet base layer into a dry clothing bag hoping it will be fine; put it in the wet bag and accept that it stays wet.

Silica gel is worth carrying in the electronics pouch rather than in the clothing bag. A 20 g sachet protects a phone and a head torch from the condensation that forms when warm electronics meet a cold morning, and it can be dried out on a stove guard in the evening. It does nothing at all for a clothing bag, where the volumes of water involved are far larger.

Water sourcing and treatment away from a tap

Wild camping usually means carrying less water and treating more, which changes the packing. A 2 litre bladder or two 1 litre bottles covers a dry stretch, and the treatment method, filter, chemical or UV, weighs 60 to 350 g depending on type. Filters are fast and heavy; chemical treatment is light and needs 30 minutes to four hours of contact time.

Plan around the distance to the next reliable source rather than around capacity. Carrying four litres because you are unsure adds 4 kg, which is more than the weight of a tent; carrying one litre because you are confident and then finding a dry stream is worse. Check a map and a forecast before you commit, and carry two litres as the default in temperate hill country.

Waterborne illness is the real risk and it is worth taking seriously. Guidance on treating drinking water in the backcountry is published by the CDC, and the principle is that filtration removes organisms while chemical treatment or boiling deals with viruses. Treat every source as suspect, including a spring that looks clean, because upstream grazing is invisible from where you are standing.

Weather: rain, frost and river crossings

Rain is the easy case: a welded bag with a rolled closure handles it indefinitely, and the failure mode is yours rather than the bag's, in the form of a closure rolled carelessly in the dark. Frost is harder, because a TPU film stiffens below about -10 °C and a stiff roll is harder to make watertight. Roll closures loosely in freezing conditions and accept one fewer fold rather than fighting the film.

River crossings are the genuinely risky case. A loaded pack that slips mid-crossing can be swept, so undo the hip belt and one shoulder strap before you step in, and keep the bag above the water if you can. If you go in, the waterproofing becomes a buoyancy aid rather than a dryness aid, which is why a sealed bag with trapped air is worth having in this specific situation.

Weather forecasting matters more here than on a day trip, because a wild camp commits you to a location for twelve hours. Mountain and coastal forecasts, including wind speed at height and overnight minimum temperatures, are published by NOAA for US waters and land areas, and a 10 °C error in the overnight minimum is the difference between a comfortable night and a cold one.

Camp routine: the order everything happens in

1. Arrive with at least ninety minutes of daylight and pitch before you cook.
2. Take the sleep bag out first, close it again immediately, and put it in the tent.
3. Hang the wet bag outside under the fly or on a tree, mouth open if it is not raining.
4. Cook with the food bag on a flat rock, then reseal it before you eat.
5. Put electronics and the precious pouch in the tent, not in the vestibule.
6. Seal every bag before dark and stack them mouth-up inside the tent or under the fly.

The second step is the one that saves a trip. A sleeping bag taken out of its compression sack early regains loft before you need it, and closing the empty compression bag immediately stops it filling with drips under the fly. An open bag left on wet ground overnight is how dry kit becomes damp kit on a wild camp.

Stack the bags mouth-up inside the tent if there is room. A roll-top standing on its base with the mouth uppermost is stable, uses vertical space efficiently and cannot spill if it is knocked. Mouth-down is the instinct and it is wrong: any water that gets past the closure sits against the fold rather than running away from it.

Choosing sizes for a wild camp

• Size the sleep bag on compressed volume plus 15%, not on loft volume.
• Give clothing its own bag and never share it with anything that has been worn wet.
• Size the food bag on the longest day of food you will carry, not the average.
• Keep electronics and documents in a 2L or 3L pouch carried on your person.
• Add a 5L wet bag if the forecast shows more than a 30% chance of rain.
• Choose 0.4 mm film for summer and 0.5 mm for shoulder season or rocky ground.
• Check every closure by torch light the evening before, not on the morning you leave.

Two sizes do most of the work. A 12L and a 10L cover one person for two nights in summer, and adding an 8L food bag and a 3L pouch covers four nights with a change of season. If you are buying one bag at a time, buy the 12L first: it is the sleep bag, and the sleep bag is the one that cannot fail.

For two people sharing a trip, resist sharing bags. Two 10L clothing bags weigh 60 g more than one 20L and they divide the load, halve the consequence of a closure failure, and let each person carry their own kit. Shared bags on a shared trip is the most common packing mistake made by pairs walking their first wild camp together.

Dry bags have been produced since 2014 in an SGS-verified 4,950 m2 facility, with compression and roll-top formats sampled in 6 to 10 working days, bulk in 35 to 50 days at a 500-piece minimum and inspection to AQL 2.5.Read our capacity guide before you choose a size, the compression bag guide for sleep system volumes, and the condensation guide for damp management, then compare against the full product line and the roll-top range.