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

https://mariossuperbchat.wordcanopy.com/posts/i-drilled-holes-and-the-cardboard-frayed-what-can-i-do-now

Give your reclaimed boxes and bags a practical upgrade by adding sturdy wire handles. Use 2-3 mm galvanized wire for strength and drill 3-3.5 mm holes to secure the handles firmly