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

https://avasnewinsights.inkharbory.com/posts/will-floral-wire-work-for-a-storage-box-handle-or-will-it-snap

Upgrade your reclaimed boxes and bags with sturdy 2-3 mm galvanized wire handles for a reliable grip that lasts. Drill 3-3.5 mm holes to thread the wire through easily without tearing the material