Every Wonder folds in three seconds to one piece, weighs under 7 kg and is designed for the overhead locker. Folded sizes: Wonder 54 x 25 x 34 cm, Wonder+ 52 x 25.5 x 41 cm, Wonder max 54.5 x 26.5 x 38 cm. Cabin allowances vary by airline and fare, so check yours before you fly.