Thanks for all the help!!!!
I just found out they are the white trash bags. And the boxes are small to medium.
I never find any fabric at a thrift store. I'm not lucky. But my Aunt was telling me about a thrift store that does have fabric and craft supplies. So I hope to go there one day soon.
I think I've been to maybe two yardsales this year so far.
The flea market once. No luck at either on anything craft wise.