UKOL BAG BY KREJCI $198.00 When Dutch designer Doreen Westphal received a bag full of inner tubes as a joke Christmas present she started to play around with the material, which resulted in her first inner tube bag. Ukol is part of the Tubus Collection. Outside material: used inner tubes. Inside material: felt (lime or red). 2 inner compartments and 1 outside compartment with zipper. 12"h x 13 3/4"w x 2 3/4"w