ZUCA Calypso Sport Insert Bag Bundles This offer is for the Insert Bag only. Complete bag/frame units are sold on other variations on this page - or you can purchase a Zuca Sport Frame separately, sold in 10 different colors. Inspired by aerospace technology, the aluminum alloy frame is light, super strong and rated to safely support up to 300 lbs The removable, hand washable, Insert Bag is made from premium water resistant 600D polyester The dual wheel system climbs stairs and curbs with ease Magneto dynamic 4" polyurethane wheels absorb shock and make for a seriously silent ride