Upgrade your reclaimed boxes and bags with sturdy 2-3 mm galvanized wire...
https://online-wiki.win/index.php/Why_Do_My_Paper_Bag_Handles_Tear_Right_at_the_Hole%3F_How_to_Make_Reclaimed_Packaging_Trustworthy
Upgrade your reclaimed boxes and bags with sturdy 2-3 mm galvanized wire handles for a cleaner, stronger grip. Drill 3-3.5 mm holes to thread the wire through easily without damaging your containers