Give your reclaimed boxes and bags a serious upgrade by adding sturdy wire...

https://speedy-wiki.win/index.php/What_Size_Jar_Makes_a_Nice_Curve_for_Paper_Bag_Wire_Handles%3F

Give your reclaimed boxes and bags a serious upgrade by adding sturdy wire handles. I use 2-3 mm galvanized wire—it’s strong and resists rust. Drill clean 3-3.5 mm holes to thread the wire easily without damaging the material