Arcteryx makes a “waterproof” pack called Rolltop (25-55). They are little bit on the expensive side but they are great for mixed weather conditions. But if you flip your boat water will find its way in. If you can spend the money I would recommend getting one and lining it with a heavy duty garbage bag. <br><br>I like ALICE military packs because of the amount of packets and comfortable straps. Much less resistant to water and snow than Arcteryx packs but if properly prepared it can go a long way. <br><br>If you know that your gear will be subjected to water that is always on the bottom of the kayak or canoe maybe a good idea is to invest into one of the Baja Bags. They are basically a duffel bags made out of water proof material with roll top or waterproof zipper. I know that North Face made it. Problem with such a bag is that it has limited use. <br><br>In my opinion I would choose a backpack that I feel comfortable with and than get a Waterproof bag for protection. When on land or when tracking waterproof bag can be rolled and attached to your pack. Choose a pack according to your posture. They have different frame sizes and it really makes a difference. Make sure that straps feel comfortable and that they don’t cut into your shoulders.<br><br>I kayak a lot so I really appreciate a value of dry gear after spending some wet time in rough water. <br><br>Matt