Upgrade your reclaimed boxes and bags by adding sturdy wire handles. Use 2-3 mm...

https://packagingrevolution.net/add-wire-handles-to-boxes-and-bags/

Upgrade your reclaimed boxes and bags by adding sturdy wire handles. Use 2-3 mm galvanized wire for strength and durability. Drill 3-3.5 mm holes to fit the wire snugly without damaging the material