Maybe this makes me old-fashioned, but in most situations, I prefer plastic-coated piping bags to disposable ones. I have a sizable stash of Ateco piping bags I've had for years, and they're still in great shape! As long as you make sure to wash and dry them well, you'll get years of great use from them--it's much more economical than buying lots of disposable bags, plus I just prefer the feeling of the softer bags over the crinkly plastic disposable ones.