today there was a plastic inside of a wine cask and i was like awsome lets pop it! so i went outside and spent ages trying to pop this thing eventually a hockey stick blew out the tap. i decided that i could use it as a bladder for a homemade camelback so i got a piece of pipe that fitted in the tap, then took out this little black rong of plastic that acts as a seal to keep the fluid from dripping out, put the bit of pipe in, put the bladder in the small front pocket of a bag (filled with water) tip- if you dont want to have to hit the thing with a hockey stick every time you want to refill it dont put the tap the whole way back in it doesnt drip water and you can get it out much easier!