Give your reclaimed boxes and bags a sturdy upgrade with simple wire handles....

https://donovansultimatewords.opalvector.com/posts/cotton-ribbon-wrap-for-handles-what-width-feels-good-in-the-hand

Give your reclaimed boxes and bags a sturdy upgrade with simple wire handles. Use 2-3 mm galvanized wire for strength and drill 3-3.5 mm holes to thread it through easily