Heavy Duty 20l Roll Top Clousure Waterproof Dry Bag with Transparent Window for Smartphone and Upgraded Waterproof Performance/capabilities with Extra Layer of Inner Pvc Film # Heavy duty dry bag tested and used by professional kayaking, sailing teams and hiking fans. Bags are made of industrial grade PVC 500D Tarp and protection against water. Compared with other Amazon dry bags, our dry bags are reinforced by an extra layer of inner PVC film to further increase its waterproof performance. User friendly design to include a transparent plastic window to show your smartphone screen from inside the bag so you don't miss important texts or social media notifications # SIZE: 20 liters is just right to carry around with almost all the key items you need to keep dry for your camping, hiking, kayaking, beach trip or any water activities. You have enough space to store beach towel, change clothes, gears, smartphone, sunscreen, flip flop, sunglass and other accessories while kayaking, sailing, rafting, hiking, motorboating and all other outdoor activities. # Roll-top plastic closure tab system provides secure and watertight seal. Follow the instructions to fill air properly so the dry bags floats (bear on mind that this is not a floating device though). This bag is not designed for being submerged in water long time but is made of highly water resistant materials for camping, boating, kayaking, snorkeling and other outdoor and beach activities. We do not recommend to storage electrical devices in this dry bags while having it fully submerged in water. # TWO SHOULDER STRAPS included for free and our straps are designed with double options for shoulder bag and backpack styles. You can switch easily from one style to another based on your needs # LIFETIME WARRANTY: This product is covered by FHF's Lifetime Warranty. We will respond in 24 hours after receiving your requests, comments or suggestions.