The Jackson Galaxy Convertible Cat Backpack CarrierCan be used as a backpack and held as "traditional" carrier Detachable shoulder strap Removable mat folds to fit both ways Holds up to 25 lbs of cat! Clip inside to attach a leash Bubble attachment Screen attachment Side pockets on both sides Adjustable shoulder straps Adjustable chest strap Strong mesh sides and top (no cat has broken through yet!) Air holes in the front (seriously, we wouldn't sell something your fur babies couldn't breathe in)