Waterproof protection: made from watertight polyester to keep backpack contents dry and protected from rain and moisture. Night visibility: builtin reflective tape increases visibility for night cycling and other evening activities, improving safety on roads and trails. Secure fit: elastic straps hold the cover firmly in place so it won't slip off during biking, hiking, or other movement. Wide compatibility: designed to fit backpacks from 8L up to 70L, suitable for small daypacks through large hiking packs. Lightweight and packable: lowprofile design that stores easily when not in use and deploys quickly when weather changes. How it solves common problems Prevents wet gear: covers your backpack in wet weather so electronics, clothing, and other essentials stay dry. Reduces risk in low light: reflective tape makes you more visible to vehicles and other trail users after dark. Stays put during activity: elastic straps eliminate the need to readjust the cover constantly while moving. Practical use scenarios Night cycling commute: slip the cover over your commuter pack before heading out; reflective tape helps drivers see you on poorly lit streets. Rainy day hikes: put the cover on a 20–40L daypack to protect layers, food, and electronics during sudden downpours. Travel and outdoor errands: keep the cover in your bag so you can quickly protect a small 8L pack or a larger 70L pack when the weather turns. Specifications and care Material: watertight polyester Fit range: fits backpacks from 8L to 70L Features: reflective tape, elastic securing straps Care: rinse or wipe clean and air dry before storing This cover provides reliable, easytouse protection and visibility for a range of outdoor and everyday activities without adding bulk.