Upgrade your reclaimed boxes and bags with sturdy 2-3 mm galvanized wire...

https://iris-wiki.win/index.php/How_Do_I_Make_Two_Wire_Handles_the_Same_Shape_Every_Time%3F

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