Yes, you certainly can. I do this with cotton net bags or reused ziptop bags and have seen others using similar bags. I’ve never asked if the scale can be adjusted so I’m not paying for my bag’s weight although this may be possible, don’t know. I figure paying a wee bit extra is part of my effort to avoid unnecessary plastics.
No, but they provide container at no additional charge
I don't know but I don't think so for weighing purposes I don't think your containers would work.
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