The frog team sky kids waterproof rucksack cover features reflective detailing and the frog team sky blue line signature design making you look like part of the pro team this backpack cover will fit over most rucksacks from 15 to 35 litre capacity thanks to the elasticated edges and straps ensuring a secure fit lastly the frog team sky kids waterproof rucksack cover has integrated flashing lights for an even better visibility to keep you seen on the roads when lighting conditions are low fro