The Proviz REFLECT360 Backpack coveris adjustable and designed to fit over all standard size rucksacks (up to 35L capacity). The Proviz REFLECT360 Backpack cover, like the whole of the REFLECT360 range, is manufactured from CE EN20471 material. The waterproof backpack cover is dual-layered to give you unparalleled water-proofing and the millions of reflective beads utilised help drivers to more easily identify your position on the road. The cover is attached securely using elasticated cords and press stud fasteners. The edges of the backpack cover are elasticated to create a secure fit around your backpack. A light loop can also be used for those wishing to attach an extra LED light. About the fabric: The fabric used for the REFLECT360 range is highly technical. During daylight it is a modest grey colour. At night, when the fabric picks up an external light source, eg vehicle headlights, it gives 'astonishing reflectivity' (quote: Cycling Active Magazine). The material is CE EN 20471 certified. Dual-layer 100% waterproofing | Easily fitted to most rucksacks up to 35L in size | Elasticated edge, straps and press stud fasteners | Light loop(to add LED light)