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I first bought two of a different brand of this size bag (Jundun) both bags carry claims of Fireproof and water resistant. The Jundun bag appears to have pretty much the same outer shell, and type and style of zipper, but that about it! The Jundun bag has a silvery lining that looks to be part of the bags fireproof design, this bag has a smooth silky (nylon) very light weight, thin lining more like the common lining found in say a woman's pocketbook, that is to say the lining has nothing at all to do with adding to anything about PROTECTION! Positives reviews of this bag are likely based on the purchaser not have a better counter part to use for comparison. The two brands are about the same price, with this being about half the bag in quality.
I haven't tested the fireproof capabilities for obvious reasons. I also haven't tested whether it is actually waterproof bc I'm lazy and I honestly didn't think about it. The overall feel is flimsy and thin. I dk if the money bags you get from the bank are supposed to be fire and waterproof, but if you know what those feel like, this one feels more thin and flimsy. The zipper looks to be a cheap plastic as well. I ordered a manilla envelope bag along with this. It is a different brand. It is much thicker, more sturdy, and has several other attributes that seem like they would hold up better. If I order another, it will be one those.
The bag seems to be constructed as other fireproof bags I've seen, but the closure mechanism appears to be a plastic zipper alone ... no flap or other mechanism to protect the zipper. It seems the zipper is a weak spot in the performance of the bag. I don't intend to torch the zipper to find out for sure but will only use it in limited situations where fireproof is not a firm requirement.