[WHY WATERPROOF? --- MIER dry bag is constructed with waterproof soft TPU + welded and heat-taped seams + roll top closure for better waterproofing. This 100% waterproof bag will prevent water rain snow dirt dust or sand penetrating this bag and keep your gears such as cellphone cameras clothes dry ROLL TOP BACKPACK --- The roll down sealing system makes the bag dry pack easy to open/close provides ultimate protection while traveling can easily pack tighter or expand larger depending on your needs HANDY POCKETS --- The external splash-proof pocket came in very handy to keep items you use a lot to reach easily. 1 padded inner pouch helps to keep your laptop or ipad safe and dry without water damage concern. 1 zipper inner pocket is for ID cards wallet phone and so on. The biggest difference from others’ dry pack is the 2 sides fold-able pockets can zip up to a small size and have a nice look BUILT FOR COMFORT --- Constructed with an ergonomic padded back panel reinforced contoured shoulder straps and low-profile sternum strap providing ultimate comfort by taking the weight off your back MULTIPLE APPLICATION --- With its waterproof features the dry sack is great for most of the outdoor activities such as Kayaking Rafting Surfing Boating Swimming Camping Hiking Beach Fishing Diving Water park etc. The outstanding modern look available in 4 colors determine the rucksack can be used at the daily bike and motorcycle commute]