On-Stage KBA4061 61 Key Keyboard Bag (Black)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,