Give your reclaimed boxes and bags a sturdy upgrade by adding simple wire...
https://wiki-velo.win/index.php/What_Wire_Handle_Setup_Works_Best_for_Carrying_Books_Without_Fear%3F
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