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

https://www.slideserve.com/gwyneyxcez/why-does-thicker-than-3-5-mm-wire-feel-impossible-to-bend

Give your reclaimed boxes and bags a sturdy upgrade by adding wire handles. Use 2-3 mm galvanized wire for strength and thread it through 3-3.5 mm holes drilled near the edges