Give your reclaimed boxes and bags a sturdy upgrade by adding simple wire...

https://lilysuniquethoughtss.urbanvellum.com/posts/what-is-the-best-way-to-reinforce-a-handle-hole-on-a-paper-bag

Give your reclaimed boxes and bags a sturdy upgrade by adding simple wire handles. Use 2-3 mm galvanized wire to ensure strength and rust resistance. Drill 3-3.5 mm holes where you want the handles, then bend and twist the wire secure