The lowly foot stool

While electric guitarists have to lug around a large amp and assorted wires the lowly foot stool is just about all the classical guitarist needs. An adjustable one runs around $15. Foot stools are great for jazz guitarists too. Usually you'll see a jazz guitarist sitting with his legs crossed to raise the thigh enough to rest the guitar on or else sitting on a chair hunched over. Try a foot stool instead.