Upgrade your reclaimed boxes and bags with sturdy wire handles to boost their...

https://daisydustmaid.com/what-comfort-radius-fits-average-hands-for-a-wire-handle/

Upgrade your reclaimed boxes and bags with sturdy wire handles to boost their durability and ease of use. I use 2-3 mm galvanized wire—strong but easy to bend. Drill 3-3.5 mm holes where you want the handles, and twist the wire through for a secure grip