These bags were purchased to store screws and drill bits. They are made of very heavy nylon and are covered in some kind of rubber material. They are very committed and seem able to withstand abuse. The zippers are average quality plastic zippers, but I'm not worried about them failing right away (unless I'm stupid and helping speed it up). Each bag also has a small clip on the corner that you can use to attach the bags to something so they don't get lost. The clips are not very strong and will break if the bag catches on something while carrying the large bag they are attached to.
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