1. 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 2. 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 3. HANDY POCKETS --- The external water-resistant pocket came in very handy to keep items you use a lot to reach easily. There is a pocket inside for storing your mobile phone, wallet, keep small items organized. 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 4. 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