I have been reading a lot about putting springs and straws and other kinds of spacers under the poly in the carts on some of the other forums.I cannot see where this would be beneficial it looks like an invitation for atty flooding and juice all over the place.I don't think you would get much more liquid in there as the air space does not seem to increase that much.And if you replace the poly on occasion it seems to feed the atty pretty good.I cart when I am driving or walking around and drip when I am sitting around cause I tend to puff more while sitting around.Any one have any thoughts on this?