How to inflate a camping mattress without a pump

First, which type do you have?

This changes the answer completely, and the packaging does not always make it clear.

• Self-inflating (foam core). Open-cell foam inside a sealed shell. Open the valve and the foam expands, pulling air in by itself. The Therm-a-Rest BaseCamp and MondoKing 3D, the Sea to Summit Comfort Deluxe, the Exped MegaMat line and the ALPS Flexcore are all this type. These need no pump at all.
• Air construction (no foam). Baffled air chambers only, like the Therm-a-Rest NeoLoft. Light, thick and warm for the weight, and entirely dependent on something pushing air in. Almost all of these ship with a pump sack.
• Air beds (the household kind, in camping clothing). PVC with I-beam baffles, 9 inches thick and a queen footprint, like the SoundAsleep Camping Series. Huge internal volume — this is the only category where doing it without a pump is genuinely hard work.

If you do not know which you have, open the valve on a flat mat and wait two minutes. If it starts to rise on its own, there is foam in it. The full distinction and what each type costs you is in self-inflating vs air mattress.

Self-inflating pads: open the valve and walk away

1. Unroll it fully and lay it flat where you intend to sleep, foam side up.
2. Open the valve. On Therm-a-Rest's WingLock valve that is a counter-clockwise twist; on Exped's MegaMat Auto there are two separate flat valves, one per side. Open everything.
3. Leave it for a few minutes and do something else. Therm-a-Rest's own wording is to “open the valve and walk away for a few minutes, tending to other chores, allowing the foam to do most of the work.” Pitching the tent is roughly the right length of job.
4. Add a few breaths at the end to set the firmness you want, then close the valve. Two or three breaths into an already-expanded 2-inch pad is nothing like inflating it from flat — this is the one place lung inflation is entirely reasonable.
5. Close the valve firmly. Clockwise on a WingLock. Exped's flat valves take a valve pin if you want to fine-tune firmness.

Air pads and air beds without a pump

In rough order of how well they work:

1. The pump sack it came with. Fill the sack with air, seal it, press it into the valve, repeat. Three to ten cycles for most pads. Sea to Summit's Airstream HV pump sack doubles as the stuff sack, so it is already in your kit; Therm-a-Rest ships a high-volume pump sack with the NeoLoft; Exped includes a Mini Pump and Sidewinder Bag with the MegaMat Auto. Check the stuff sack before you decide you have no pump.
2. A dry bag as an improvised pump sack. A roll-top dry bag works almost as well as a purpose-made one: fill it, roll the top, press. Hold the open end over the valve rather than trying to seal it perfectly.
3. A bin bag or stuff sack. Same principle, less sealing. Scoop air by sweeping the bag through the air, gather the neck, squeeze into the valve. Slower and it works.
4. A car vent or a 12 V tyre inflator. If you are car camping and the mat is a 9-inch air bed with an external valve, a 12 V inflator from the glovebox is faster than anything else here. Keep the pressure low — these mats hold very little pressure and over-inflation splits seams.
5. Your lungs. Workable on a 2-to-4-inch pad, miserable on a 9-inch queen air bed, and worth avoiding where you can. See below.

One thing not to do: a vacuum cleaner in reverse or a leaf blower against a valve not designed for it. The valve and the shell on a camping mat are built for low pressure and low flow, and the failure mode is a split seam that no warranty treats as a defect.

Why lung inflation is a last resort

Exhaled breath is warm and close to saturated with water vapour. Blow up a mat with it and that moisture condenses inside a sealed shell you cannot open, dry or clean. On a pure air mat it sits in the baffles; on a foam-core mat it soaks into open-cell foam that will not dry.

That matters because of what the warranties say. Therm-a-Rest's own storage guidance warns that prolonged storage somewhere damp can cause mildew damage that the limited lifetime warranty does not cover. SoundAsleep covers manufacturer defects and explicitly excludes punctures and holes from use. Sea to Summit covers manufacturing defects and charges for other repairs. Internal mildew is, in every case, your problem — and it is the one failure mode you cause yourself with an otherwise free inflation method.

There is also a cold-weather version of the problem: in freezing conditions the moisture in your breath can freeze inside the mat, which both reduces loft and makes the insulation worse. If you have a pump sack, use it. If you must use your lungs, do it in the warm part of the day and store the mat open and dry afterwards.

What your mat already came with

Most people searching for this do own a pump — it came in the box and went in a drawer. Across our registry:

Sea to Summit's Airstream HV pump sack is the mat's own stuff sack. Exped ships the MegaMat Auto with a Mini Pump, a Sidewinder Bag and a repair kit. SoundAsleep's Camping Series includes a rechargeable external pump and a patch kit. Therm-a-Rest's foam-core pads need nothing, and its air-construction NeoLoft ships with a high-volume pump sack and a repair kit.

Four mats that inflate without a separate pump

Five mistakes that cost you a mattress

1. Over-inflating. A camping mat is not a car tyre. A rock-hard mat is less comfortable, less insulating where it matters and much more likely to split a seam. Firm enough that your hip does not touch the ground is the target.
2. Leaving it fully inflated in a hot tent all day. Air expands. Therm-a-Rest's guidance is to release a third to half of the air in daytime heat, which costs you nothing and removes the stress from the seams.
3. Using a high-pressure pump. Compressor, tyre inflator at full pressure, leaf blower. The valve and shell are low-pressure components.
4. Packing it damp. Whether the moisture came from your breath, condensation or wet ground, a sealed damp mat grows mildew, and mildew damage is excluded from every warranty we quote.
5. Storing it rolled in its sack for the winter. Therm-a-Rest says to store self-inflating pads unrolled and inflated with the valve open. A pad stored compressed loses loft permanently, and then people assume the mat was poor.

If the mat will not hold air at all, that is a leak rather than an inflation problem — we walk through finding and patching one in how to fix a camping mattress leak. If you are shopping rather than troubleshooting, the mats with a pump built in are ranked in best camping mattresses with a built-in pump, and the whole category is in best camping mattresses.