hot seal waterproof durable colorful ukulele cotton case bag with storage (21in, green) hot seal about size</br>size 21in = approx. 57cm in length, suitable for 21-inch ukulele.(soprano)</br>size 23 / 24in = approx. 65cm in length, suitable for 23/24 inch ukulele.(concert)</br>size 26in = approx. 69cm in length, suitable for the 26-inch ukulele.(tenor)</br>if you are unsure of the size of your ukulele, we recommend that you measure your ukulele first. the ukulele bag must be longer than your ukulele. please note this!