Not as sturdy as the original metal flask, but a very nice less expensive alternative. The only complaint I have is that the shell and bottle are the same length, so if you have some air trapped in the bottle the bottom will bulge a bit. This causes it to be a little wobbly when you set it down. If the shell was half a mil longer it wouldn't be a problem. I've used it on all three of my squonk boxes, and it works great. Also great in drop mode as well. Worth a get.