With a seamless high frequency welded construction and a simple to use two-way sealing system (top or side), making it fully submersible, this 25L waterproof backpack really should be your Backpack of choice.The Waterproof Backpacks are manufactured from durable and environmentally friendly TPU materials, so are designed for outdoor adventures.From the large front pocket with airtight zipper to the padded shoulder straps and soft back panel, this feature-packed Waterproof Dry Backpack is a comfortable and handy bit of kit for any water-based sportsman.