The Guinness Book of Records award-winning GB Pockit ($151) stroller folds up to an impressive 11.8 inches by 7 inches by 13.8 inches, and weighs less than 10 pounds! If you'll be travelling frequently by air, this stroller is as easy as it gets — the frame is narrow enough to push down the plane aisle, and when folded, it can be stored overhead or under the seat in front of you.