plastic bag intrument

it's my first atenpt to make a kinf of saxo-plastic bag (i don't know how it's called)
you need to cut the first layer of the bigest tube and put a plastic bag on the tube and secure it whit string or a with some adesive (like the picture)
it's not tuned and i do not think i'll work more on it .... it's an idea for those who seach to make musical instruments

i 'll probably add a better version soon