This is the first ever dry bag I've bought and I was a little apprehensive about the size, comfort and performance of the product. However I needn't have worried as it exceeded my expectations on all fronts. Just to set the context; I'm a 5ft 5inch 65 year old female. The size was perfect and even when packed with a weight of 16 kilos it was extremely comfortable to wear on my back due to the soft, wide shoulder straps, I almost forgot I was wearing it when walking around the duty free shops at the airport. I purchased it for two reasons; as a large backpack for my carry on cabin bag, and, to keep my stuff dry when I had to disembark a boat offshore and walk knee deep in the ocean to an island. I got hit by a wave and fell over with my drybag , pummelled by a few more waves before I was able to stand up again, the performance of the dry bag was really put to the test. Extremely happy to say the entire contents were completely dry! A great product, thank you red