Perfect when you're on or near the water: the Packable Rolltop Dry Pack 30 from Dakine.
The backpack is lightweight, completely waterproof and equipped with a practical roll-top closure. It stows all the things you don't want to get wet when doing water sports or at the beach and, conversely, you can pack wet swimwear or a dripping wetsuit in it on the way home.
The breathable shoulder straps make it comfortable to carry.
No matter whether you want to keep moisture out or in: The Packable Rolltop Dry Pack 30 is always a good choice.