Sealson UNUS 52 Backpack Ultra 200X - WhitePresenting a manifold number of technical details and futuristic materials, the UNUS52 from Taiwanese brand, Sealson has rendered the humble backpack into science fiction. The 52L main compartment is constructed from a patented polyethylene fabrication called UltraWeave, a high density waterproof fibre, and is finished with roll top closure. The straps have been reimagined as a trail running vest, complete with the prerequisite flexible mesh pockets