Exped Telecompression Drybag 13 Litre Small Red. Fully waterproof compression drysacks for sleeping bags, clothes or other bulky items. These simple but highly 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, & 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.