I'm that guy with a big black compactor bag with 2 slits cut out for straps, and 2 little slits for the belt (and duct tape at the end of each slit.) I don't do it because I'm frugal, or because I'm fashionable or the opposite. I do it because it absolutely work best for me. I have owned pack covers before, but ultimately my trash bag is preferred - meaning I wouldn't use a pack cover if you bought it for me. I've never used a Packa though so if you're buying I'll try it. ...As far as my trash bag pack cover: The weight - No idea, Material - 3 mil, The cost - I dunno 45 cents?, Durability - replaced 3 times over the course of a thru hike. I'm not saying anybody should do it my way, it's just what works for me.