Exped Telecompression Drybag 36 litre Large Brown. Fully waterproof compression drysacks for sleeping bags, clothes or other bulky items. These simple but effective drysacks are perfect for trekkers & backpackers who rely on having dry kit on extended trips. Stuff your kit into the bag & then roll the top down at least three times to ensure watertightness. As the bag is waterproof air will be trapped inside & make it really hard to compress the contents, so the boffins at Exped fitted a purge valve to let the air escape as you squash your stuff. Our tip is to compress the contents by pushing down & not by pulling on the straps. Only tighten the straps when the contents are compressed to stop them expanding again, oh, and dont forget to close the valve. Team this with a Schnozzel Adapter to use as a pump to inflate your Exped sleeping mat. So you sleeping bag stays dry, compress to save space & you dont get out of puff blowing up your mat. It is the dream team of sleeping rigs... Pun is fully intended.