OverBoard Pro-Vis Waterproof Backpack (20L, High Visibility Orange). Be seen day or night with the 20L Pro-Vis Waterproof Backpack in high visibility orange from OverBoard. It protects your gear from the elements while keeping you safe with its bright, easily noticeable color. The bag is welded for waterproofing in such a way that there are no visible seams. This process and a simple roll-top sealing system ensure 100% waterproofing, making the Pro-Vis pack suitable for quick submersion. Benefit from handy features like a large internal zip pocket, elastic front webbing, and an attachment loop for LED lights.