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

https://sirachapete736.gumroad.com/p/color-code-storage-handles-with-wraps-how-do-people-actually-do-it

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