These Roadrunner keyboard cases are made of a super-tough water-resistant exterior with a 25 mm foam interior with reinforced webbing. Its pockets provide plenty of space for all your cables, music books and pedal.Dimensions for each model (inch): 
Regular 61 Key: Interior length: 41.5”, interior width: 14.5”, interior depth: 5”, exterior length: 43”, exterior width: 15.5”, exterior depth 5.5” 
Slim 88 Key: Interior length: 54.5”, interior width: 14”, interior depth: 5.5”, exterior length: 55.5” exterior width:15”, exterior depth: 6.5”
Regular 49 Key: Interior length: 35”, interior width: 12.5”, interior depth: 5”, exterior length: 36”, exterior width: 13.5”, exterior depth: 6”
Deep 76 Key: Interior length: 50.5”, interior width: 17.5”, interior depth: 6.5”, exterior length: 51.5”, exterior width: 18.5”, exterior depth 7.5”
Deep 61 Key: Interior length: 39”, interior width: 16”, interior depth: 6.5”, exterior length: 40”, exterior width: 17”, exterior depth 7.5”