The Deep Six gives you the best of both worlds – it is a waterproof backpack with soft, adjustable straps, AND it is a waterproof deck bag.
It has multiple straps and D-rings for securing onto just about any surface. You can strap on to your SUP, kayak, canoe, boat, bicycle, motorbike, etc.
For safety, the Deep Six Deck Pack is bright orange, with reflective paneling for awesome visibility in low light.