So, I'm 0 for 2 in shipping growlers. The first time sabotaged the whole box, and the second time, I got a tip to wrap the contents in garbage bags, and while that preserved the box, the growler (technically howler/mini-growler, etc.) still leaked pretty bad. Am I missing something here? Am I using the wrong types of growlers (screw top vs flip top)? Or is growler shipping generally something that's not done, and growler trades are done IP?