I've always brought it in my carry-on, though I really wouldn't suggest that for most people. But I don't bring a pipe, so I always just buy a cheap one from the outdoor market (where I also go crazy buying sandals!) and the last time my husband went to buy one (while I was busy buying a belt!) the kid who sold it to him offered to "fill it for you man" and was really surprized to find out we brought our own. :jointsmile:
I love Mexico! Have fun-