Zippers are a very important component of a bag and should never be compromised. Once a zipper fails, a bag might become useless. Brass is generally the choice for a quality zipper, with platings in nickel or copper. The highest quality zippers have teeth that are not sharp and a zip-slider that is also made from brass (not an inferior metal). Most zippers break when the cloth along the edges of the teeth has worn through, so you want to look for a very sturdy zipper-tape fabric. It’s also important that zippers be set into the bag properly and operate smoothly, so give it a few test runs to make sure it glides smoothly and their is no unnecessary friction. Lastly, the weight & size of the zipper should be appropriate for the size of the bag, considering you will probably overstuff it at some point.
After zippers, hardware is probably the second most frequent cause of repair issues. Hardware such was d-rings, buckles, and rivets should also be made using solid brass but copper, bronze, nickel silver, and plated zinc can also be used. The finish on the hardware should be clean, showing no cast lines, and their size should look appropriate (and strong enough) for the maximum capacity and weight of the bag. All hardware should be securely attached, and all stress points should be reinforced with extra stitching. If rivets are used, back-washers are important to prevent pull through. On buckles the tongue should be heavy enough not to bend and fail. Don’t be afraid to give the hardware a good strong test pull to make sure it’s built to last.
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