Very nice dry bag that is intended for "out-of-bag" use, meaning it's not intended to be used as a stuff sack thrown into another bag. That means the material is thicker and durable. I've used the 15L version for paddle boarding and it has kept everything inside of it bone dry despite getting thoroughly splashed and temporarily dunked. That said, I would not rely on it for any extended immersion based on its design and IPX rating.The durability is yet to be seen, since I would expect this product to hold up well for years with moderate use. I will update this review if it falls short of expectations, but I see no obvious problems with the build or feel of the product.There's no listed weight right now, but my 15L with the strap weighs just about 9 oz (255 grams), which I feel is average. However, dry bag weight is directly linked to it's durability and waterproofing. Since it is intended for "out-of-bag" use, I would not expect this to be able to get much lighter without unreasonably sacrificing durability.Finally, as a general matter, I have used and currently own multiple Osprey products, including a large hiking backpack, day pack, hydration bladder, and stuff stacks. I have had a few minor problems here and there but have always had a good response from customer service when I have run into problems. Figured that is worth mentioning.