The black 25L Wet & Dry Backpack from Aquapac is definitely not for a couch potato, This is a pack for the person who takes his outdoor time seriously and is not afraid of the elements. It doesn't matter if you're a day tripper fighting his way through the crowds at an outdoor train platform or heading out for a day hiking through a rain forest, this bag will get your gear through it spot-on dry. Put your 17 laptop inside the pack and make a day of it even if you just want to stop, write a letter, take notes or send an email. The pack is a TPU, nylon/polyester fabric that is abrasion resistant and which will do very well in temperatures even down to -45°C. At 100% PVC free, the bag won't crack when it's cold. No need to worry about the seams since water won't get through even at the sewn points. Slip on the trail into a puddle or brook? No problem. Get up and keep walking. Your equipment and clothes will remain dry. The Wet & Dry Pack seals via a 3x roll-seal system that closes tightly and protects your gear against the elements. The roll-seal is reinforced by 2 two strong buckles plus 2 string tabs that can be used for even more closure. The full-sized internal pocket is waterproof with space to separate both wet and dry clothes. The inside pockets are yellow which makes it easy to see into the bag - easy to spy small items stuffed down at the bottom. You'll also have a dedicated key pocket that makes organizing small items easier - and that will save you time when you need to grab them quickly.