Modern sleeping bags are incredibly efficient and their high tech fabrics, and the insulation between them, performs superbly. Often a breathable and fairly weatherproof outer layer combines with a soft drape and highly breathable inner layer – the manufacturer always need to get the balance between keeping the elements at bay and allowing enough air flow to allow the bag to loft.
These modern bags also pack really small and I always choose a waterproof dry sack that is as small as possible for on the trail storage (contrasting with always storing my bags in a loose cotton storage bag at home). The only problem with this dry bag storage can be that, when you come to stuff your bag away, the air can be slow to work its way through the less breathable outer layer of fabric. Our 36th Peak Mountaineering Top Tip offers a simple and efficient solution.
All you need to do is turn your sleeping bag inside out before packing it away. This allows the air to squish easily out of the highly breathable inner fabric layer as you pack it away. Much more efficient, quicker, and maybe even kinder to the insulation too. The only caveat to this is if you are pulling your sleeping bag back out in damp conditions (such as a damp tent or snow shelter) – in this case you might want the more weather protective outer shell to come out first!
Posted by Cal