Lightweight Dry Bag | Lightweight Waterproof Bag

What are the differences between roll-top backpacks and zipper ones?

Generally, roll-top backpacks are often more waterproof if sealed correctly, because true waterproof zippers are expensive and thus most zippers are only water-resistant instead. Therefore, waterproof roll-top backpacks are a better choice in water sports like boating, kayaking, etc.

Secondly, roll-top backpacks are often simpler with fewer straps, pockets, or zippers. Thus roll-top backpacks are generally less expensive both for buyers, retailers, and manufacturers.