1. 100% Waterproof & Sandproof --- MIER dry duffle backpack is made of abrasion resistant and water repellent tarpaulin material, have fully welded seams to keep your gear dry and safe. Top roll design with hook and loop closure, easy ways to use, simply fold the roll-down top at least 3 times, then use the side clips & adjust for a snug, compressed fit 2. Multifunctional Pockets ---- 1 water-resistant zipper front pocket, you can keep smaller things and easy access (The front pocket is only splash-proof)1 internal zipper pocket for storing your valuables2 inner mesh pockets, convenient for you to organize your itemsThe large waterproof main compartment can hold everything you need for your trip 3. Large Capacity but Lightweight --- Whole dimension is 24.75L x 13.75W x 13H inch with 60L Capacity; Only 3.3 lbs; The large opening secured with hook and loop fasteners and enough room for quick storage, keeps your things dry and safeDifferent color choices make it stand out in the crowd and show your personality 4. Convertible Dry Bags with Versatile Carrying Ways --- Designed with adjustable backpack straps that are easily attached or detached, adjustable sternum straps ensure a suitable place to wear, also has an adjustable/removable shoulder strap and 4 sides soft haul handle for multiple carrying ways. It can always meet your different needs, whether it is cross-body, shoulder-body or hand-held