Review on XELFLY Submersipack Waterproof Backpack - Submersible, Inflatable, Floating TPU Coated Durable Nylon Dry Bag With Airtight Zipper For Kayak, Fishing, Boating, Hiking, Paddle Board (Deep Blue, 18L) by Bryce Marshall

The first thing I did when I got this in the mail was fill up the bathtub and fully submerge it (picture included). It is completely airtight, no leaks. You do have to make sure the zipper is all the way sealed shut, but the instructions illustrate that. The heavy duty type zipper is a bit difficult to zip, but the oil they send with the bag alleviates that. I like the style. Its modern and sporty. Lots of pockets and and hooks to hang stuff from. The material is kinda hard and crunchy. Different than a regular backpack, but more protective and durable. The padded shoulder straps seem comfortable with a standard day pack amount if stuff. (Haven't had a chance to try it with a heavier load yet.) So far, I am pleased with this purchase. 👍