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Bushcraft: What Size Dry Bag Do You Need?

Why bushcraft loads break normal dry bag maths

Standard capacity advice assumes soft, compressible kit: clothing, a towel, a lunch. Bushcraft kit is the opposite. It includes rigid steel, sharp edges, cordage that holds water, and a sleep system that must stay dry no matter what else gets wet. That combination changes both the size you need and the number of bags, because the failure mode is no longer a wet sandwich but a punctured bag or a sleeping bag soaked by an axe left wet.

The second difference is how long the kit stays packed. A paddler empties the bag the same afternoon. A bushcraft camp may stay set for three days in steady rain, so anything sealed inside stays sealed, and condensation becomes a real problem in a bag that swings from 4 °C at night to 18 °C in the day. Sizing for bushcraft therefore means sizing for separation and for access, not just for volume.

Measuring a real bushcraft kit

Before you buy anything, weigh and measure what you actually carry. The list below is a three-season weekend load for one person in a temperate woodland: a tarp or tent, a sleep system, a cooking set, two days of food, water, tools, clothing, fire kit and first aid. Packed as it would be in the field rather than compressed to a theoretical minimum, that load comes to 29 to 36 litres and 9 to 13 kg.

Read the last two columns together and the bag count becomes obvious. Only one group on that list, the clothing and the sleep system, absolutely cannot get wet. The tarp, the cooking set and the tools can be wet without consequence, so they do not need to share the expensive waterproof space. That single distinction is what keeps a bushcraft load from turning into one enormous, heavy, impossible-to-search bag.

Sleep system: matching a bag to a sleeping bag

This is the one sizing decision with no room for error. A sleeping bag that gets wet loses most of its loft, and a bag that cannot be re-rolled dry at dusk is a cold night. Compression matters here: a down bag can be squeezed harder than a synthetic one, but both need enough residual loft to work, so the dry bag should be sized to the loosely packed volume plus 30 percent rather than to the compressed figure on the stuff sack.

The roll-top loss column is the one people forget. A 20L bag closed with three folds loses 2.5 to 4 litres of usable volume, so a 0 °C down bag that compresses to 6.5 litres still needs the 20L rather than a 10L. If you also carry a liner, a pillow or a spare blanket, go one size up rather than forcing the closure, because a closure forced shut over a compressed load is the most common source of a damp bag in the morning.

Two practical habits protect the sleep system better than any bag size. Pack the bag inside a cotton or synthetic liner so body moisture and ground damp never reach the down, and keep the sleeping bag dry bag at the bottom of the pack where it is least likely to be pierced by a tool handle. Sizing detail for sleep systems of every rating is in the sleeping bag sizing guide.

Cooking kit and food volume

A bushcraft cooking kit is bulky relative to its weight: a 650 g pot set occupies 2.6 litres because rigid metal does not compress. Add a stove, fuel, a mug, a spoon and a small wash cloth and the kit reaches 3.5 litres. Food for two days is the other half of the equation, and it is denser than most people expect: 1.8 kg of dry food packs to about 3.4 litres once pouches and a brew kit are included.

Keep cooking and food in one 10L bag and separate the two groups inside it, with food in a sealed pouch and the pot set wrapped in a cloth. Soot on the outside of a pot transfers to everything it touches, and a sooty bag then transfers to your sleeping bag when the two are stacked in a pack. The volume planning for stoves, fuel and rations is set out in the cooking kit sizing guide, which covers both one-pot and full-kit setups.

Sharp tools and the puncture problem

An axe, a saw and a fixed-blade knife are the reason bushcraft loads need a different packing discipline. A 0.5 mm TPU film resists abrasion well but a sharp corner under load will cut it, and a cut in a dry bag is unrecoverable in the field unless you carry a patch kit. The rule is simple: nothing sharp goes inside a dry bag unless it is sheathed, wrapped and placed so the edge cannot press against the film.

• Carry the axe in a mask or sheath with the bit covered, then in a tool roll outside the pack.
• Wrap a folding saw blade in a cloth and keep it flat against the pack frame, never against a dry bag.
• Keep the knife on your belt rather than in a bag; a belt knife is also faster to reach.
• Put the tool roll on the outside of the pack where a puncture damages nothing else.
• Carry a small TPU patch kit: two patches, alcohol wipe, and a 40 mm roller.

If you must carry a sharp tool inside a bag, double-bag it: the tool in a heavy canvas sleeve, the sleeve inside the dry bag, and the bag packed so the tool sits along a flat face rather than in a corner. Corners are where film fatigue starts and where punctures concentrate, because the load presses the fabric against a point instead of spreading it across a surface.

Clothing: the wet and dry split

Bushcraft clothing divides into two groups that should never share a bag. The dry group is the spare base layer, socks and the insulation you put on when you stop moving; those must stay dry at any cost. The wet group is everything you have been wearing, which will be damp from sweat and rain by mid-morning and will stay damp for the rest of the trip.

Carry the dry group in a 10L roll-top and the wet group loose in the pack lid or in a mesh sack strapped outside. Putting damp clothing inside a sealed bag guarantees the whole load stays damp, because there is no airflow and no drain in a roll-top. If the weather turns and the wet group must come inside, put it in its own bag rather than into the sleeping bag compartment, and open it the moment you make camp.

Fire kit and keeping tinder genuinely dry

Fire is the bushcraft skill that fails first in wet weather, and it fails because of tinder rather than technique. Tinder needs to be dry at the level of individual fibres, which means it must be sealed away from humidity for the whole trip, not merely kept out of the rain. A 2L roll-top with a handful of birch bark, a few cotton pads and two fire steels occupies almost no space and is the highest-value bag in the whole load.

Pack the fire kit in the smallest bag you own and keep it at the top of the pack or in a hip pocket, because a fire kit buried under a sleep system is a fire kit you will not fetch in the rain. Add a second, sealed micro-kit to a jacket pocket: one fire steel, six cotton pads and a lighter. Redundancy here costs 80 grams and is the difference between a warm evening and a cold one.

Water: carrying and treating

Water is the heaviest thing in a bushcraft load and the one item that should never go inside a dry bag. Two litres weighs 2 kg, and a leaking bottle inside a sealed bag ruins everything it touches. Carry water in rigid bottles in pack side pockets, and keep any treatment kit, filter or tablets in a small pouch with the cooking bag rather than loose.

Plan the volume around the source. If you camp within 400 m of running water, carry 1 litre and treat at camp; if the site is dry, carry 3 litres and accept the 3 kg penalty for the first afternoon. Guidance on drinking-water treatment in the backcountry is published by the CDC, and weather planning before you commit to a dry site should use the forecasts from NOAA.

First-aid and emergency items

A first-aid pouch is small, dense and absolutely must stay dry, which makes it the ideal candidate for the smallest bag in the system. A 400 g pouch packs to about 0.9 litres and fits a 2L roll-top with room for a headtorch and a spare battery. Keep it at the top of the pack where you can reach it without unpacking, and check it at the start of every trip rather than at the end.

The medication row belongs on your person, not in the pack. A pack that goes into a river or is left at camp while you work 200 m away takes the medication with it, which is the one failure a bushcraft load cannot absorb. Volumes for each kit size, from a minimal day pouch to a group kit, are in the first-aid sizing guide.

How dry bags fit inside or outside a pack

Dry bags inside a pack work as organisers: the sleep system at the bottom, clothing in the middle, cooking and food at the top, and the fire and first-aid pouches in the lid. That order reflects access frequency as much as weight, because the two things you reach for in the rain are the fire kit and the first-aid pouch, and neither should require unpacking the sleep system.

Outside the pack, dry bags work as strapped volume for the wet group: a tarp, a wet jacket or muddy cordage. Strapping a dry bag to the outside exposes it to abrasion, so use welded D-rings and a 25 mm strap rather than shock cord alone, and keep the closure facing down so rain cannot run along the fold line. The trade-off is worth it for wet kit, and a bad idea for anything that must stay dry.

Weight budget against walking distance

Volume is not the only constraint; distance decides how much of that volume you should actually fill. A 13 kg load is comfortable for 3 km to a fixed camp and punishing for 18 km of mixed ground. Use the table below to check your plan before you leave, and cut volume rather than comfort items when the numbers disagree.

Note that the waterproof volume barely falls as the distance rises, while the total load falls sharply. That is because the sleep system and the cooking kit do not compress much, so the saving has to come from tools, water and duplicate clothing. If your plan fails the distance row, cut steel before you cut insulation: one knife instead of three, and no spare pot.

Winter and shoulder-season adjustments

Cold weather inflates a bushcraft load in three ways at once. The sleep system grows from about 9 litres to 18 or 20, clothing doubles because a wet outer layer needs a dry replacement, and the fire kit expands because you need more tinder and a longer burn. A 30-litre summer plan becomes a 45-litre winter plan without a single luxury item being added.

Cold also changes the material behaviour. TPU film stiffens below freezing, so roll the closure slowly and with warm hands rather than forcing a cold fold, and expect the bag to be less forgiving of being overfilled. Snow loads are lighter than rain loads in water terms but heavier in bulk, so brush snow off before packing rather than letting it melt inside. Bags carried in snow are shown in our wild camping guide, which covers the same kit for a fixed base camp.

Field routine and pre-trip checklist

A bushcraft trip gives you two moments to check the system: before you leave and at camp on the first evening. When you get home, empty everything, rinse the bags, dry them open and store them loosely rolled. Bags stored compressed for months develop creases that become the failure point two seasons later, which is a slow, entirely avoidable loss.

1. Weigh and measure the full load, then check it against the distance table.
2. Assign every item to one of three bags before you pack a single thing.
3. Confirm the sleep system bag closes with three folds without being forced.
4. Sheath or wrap every sharp edge and stow the tool roll outside the pack.
5. Roll each closure three times, squeeze the bag and listen for a hiss.
6. At camp, open the damp bag first and hang it under the tarp.
7. Keep the fire kit and first-aid pouch within reach without unpacking.
8. On return, rinse, dry in shade and store loosely rolled with the buckle open.

If you are kitting out a group rather than yourself, multiply the numbers rather than adding a single large bag: three people need three sleep bags and one shared cook bag, not one 60L bag nobody can search. Our waterproof bags have been produced since 2014 in an SGS-verified 4,950 m2 facility, and we document the construction behind the welded seams; the full size ladder from 2L to 90L is in the capacity guide.

Two closing references close the loop on care. Long trips are hard on closures and fold lines, and the backpacking care routine sets out what to do at the end of a multi-day walk, while the crease damage guide explains why storage shape decides service life. Start from the roll-top dry bag range when you pick sizes, and compare the same load against the thru-hiking comparison if your trip is more walking than camping.