Upgrade your reclaimed boxes and bags by adding sturdy wire handles for easier...

https://kylerscoolblogs.novacrestiq.com/posts/how-do-i-know-if-my-reclaimed-box-is-too-weak-even-with-handles

Upgrade your reclaimed boxes and bags by adding sturdy wire handles for easier carrying and a cleaner look. Use 2-3 mm galvanized wire for strength and drill 3-3.5 mm holes to fit the handles snugly