Depends on the type of plastic bag. If we're talking Walmart grade plastic bags then those are not going to hold 20 pounds. You'd be lucky to hold 10 pounds wit

Depends on the type of plastic bag. If we're talking Walmart grade plastic bags then those are not going to hold 20 pounds. You'd be lucky to hold 10 pounds with those terrible bags. Safeway bags, thought? Those are crazy thick and strong and could easily handle 30 pounds.