Give your reclaimed boxes and bags a sturdy, comfy grip by adding wire handles....

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

Give your reclaimed boxes and bags a sturdy, comfy grip by adding wire handles. Use 2-3 mm galvanized wire—it’s strong and resists rust. Drill 3-3.5 mm holes near the edges for easy threading