The exped transfer wheelie bag this clever transport and protection bag with wheels converts any backpack or duffle bag into rolling luggage it keeps your gear clean and safe during flights and the rest of your trip the zippered access to the suspension system of your backpack allows for a swift switch between rolling and carrying the roll top closure of the bag allows volume adjustment for packs between 40 80 l or duffle bags up to 100 l when not in use it packs down to 36 x 30 x 24 c