Extra-large Diaper Bag Definition from BabyGearLab's Dictionary of Terms You can zip down the interior for easy access, and gusseted pockets help prevent items from tumbling out.Credit: BabyGearLab StaffWe used the JuJube Be Prepared Diaper bag that measures 18.5"W x 14"H x 6.5"D. Last updated: Tuesday November 15, 2016 12:21pm