OEX Dry Pump Sack £6.40 (+£3.95 delivery or free click & collect) at Go Outdoors

Bit niche but if you're a Go Outdoors member and can click and collect this is an excellent deal for a pump sack. Ideal for inflating sleeping mats (the non-SIM type) quickly and without moisture from your lungs. Still cheap even with delivery. If you're not a Go Outdoors member then Millets/Blacks have it for £8 + delivery using the same BRAND20 code. OEX branded but works with most mats.

Fully inflate your OEX SI mat with totally dry air, avoiding internal mould build-up.

Useful for the OEX Traverse IMX & Fulcrum EV sleeping mats, this Dry Pump prevents internal mould - unlike blowing up with your breath.

Just connect it to your mat, open the end of the bag and fill with air, twist the top down to inflate the mat.