PU (Polyurethane) and ULY (Unsaturated Long-chain Urethane) coatings are two popular options, and they indeed have distinct characteristics, including weight. In the video, PU coated fabric is thin and light , which contributes to the overall lightweight feel of the fabric. ULY coated fabric is slightly heavier than PU coated fabric. A backpack made from PU-coated fabric might be your preferred choice due to its lightness, ensuring you can carry your essentials comfortably. And a tent crafted from ULY coated fabric could offer the durability you need to withstand harsh conditions.