Swap out weak handles by adding 2-3 mm galvanized wire to your reclaimed boxes...

https://storylatticex.com/s/TcY57xA_6XJleHSa_9A5N

Swap out weak handles by adding 2-3 mm galvanized wire to your reclaimed boxes and bags. Drill 3-3.5 mm holes to thread the wire through, then twist and secure it tight