Ah, there's a question I'm going to sneak away from. I shouldn't have hinted, sorry for being a tease, but it's just not ready for show-and-tell yet :)
On food-safe bags; we can't make a better recommendation than what the manufacturers make themselves.
Personally, I've used ziploc when I've been able to afford it.
For the interim what do you and Mellow recommend customers use for a "temperature-safe bag" (per instructions on your website)?