A daypack is essential whether we are traveling with kids or not, but some are too bulky and some too small. LL Bean has it just right with the Ridge Runner 25 Day Pack. It has strong back support — enough to carry a large laptop computer and accessories, as well as a water bladder for staying hydrated. We carried it everywhere on our recent cycling and river cruise with Backroads and AMA Waterways as well as in Berlin, Budapest and Prague. Fits comfortably under the seat in front of you on long flights too! Thanks LL Bean!