However many keys you carry -- 49, 61 or all 88 -- the On-Stage KBA4000 Keyboard Bag Series keeps them safe, secure and conveniently transported. Each model features a heavy-duty, weather resistant nylon exterior for protection against the elements and a 3/4" interior foam padding that guards against dings and drops. Backpack style straps and carry handles for 49 and 61-key instruments or carry handles and wheels for the 88-key bag make transport a breeze, while an oversized hook & loop side pocket puts sheet music, sustain pedals, power sources, cables and more, right where you need them