Organisation cubed. The UL Boot Cube is designed to help you pack your walking boots or shoes into your rucksack or travel pack. Made from siliconised nylon, boot cube will slide in and out of your bag with ease, whilst a wide opening allows you to fit your boots in with ease. A zippered vent on the top provides breathability, which is essential after a long walk. Reinforced base material will stand up to the tough soles of walking boots, perfect for putting muddy boots into and keeping them separate from your nice dry clothing.