The Jackson Galaxy Convertible Cat Backpack Carrier

Can 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)