That's funny, Maddie, and I considered doing that, but it would still have taken a long time and created a serious storage problem. I don't use that many bottles or jars (at one time I was asking for jars) and I don't think my friends do either. The other issue in asking other people to save containers for you is they a) have to remember, b) have storage space, c) be willing to clean them, etc. It was just getting too complicated.
Right now I am just trying to find a way to collect coffee grinds. My friend has a restaurant and has said yes, but we haven't coordinated a way to do it. When things get busy, people don't remember stuff like that. Also, I don't want to end up with more stuff than I can use or store - storage is a big issue right now.