I have been using these sorts of "firerproof bags" for many years for storing RC lithium polymer batteries. In the RC hobby, these bags are generically called a "LiPo Sack". Such batteries can have a flammably bad day if they are overcharged or damaged. Sometimes the damage isn’t visible so it’s best to be safe. I keep LiPo batteries inside while charging and while transporting to and from the flying field with my aircraft in my car or truck. I’ve even had my smaller chargers inside the sack with a battery while charging, with only the power supply leads coming out the corner where the flap folds down.
This bag is larger than my other Lipo Sacks. The flap that secures it closed is around twice the length of the others, and so is the hook and loop fastener. This allows the bag to expand to hold more items, thicker items and still be able to close securely. That’s been a limit on my other bags, especially with a charger inside, but also as I’m flying larger aircraft that use some seriously large battery packs. The price is comparable to what I have paid for smaller RC Lipo Sacks, but with the larger size it’s a particularly great value. On top of that, the quality of the seams, velcro, rounded edges is simply better. It clearly has a sticky/slippery silicone impregnated exterior, much more than others, and a tighter weave fiberglass lining the interior. The silver outside is definitely not silver duct tape but appears to be a flame retardant material. I’m not going to intentionally start a fire inside or outside of it to see how it and the contents survive, but the construction is superior to others I’ve been using for years.
Until I found this Colcase bag, I didn’t know that these bags were also used for storing documents to keep them safe from fire. It actually makes sense for that purpose.
I did try to fit some documents inside, and am pleased that the large UPS Priority Mail cardboard envelope, thick with all of my tax stuff return inside, fits nicely inside with room to spare for several more. It’s a pretty roomy bag to store documents. I actually keep super important stuff in the safe deposit box, but for things around the house, before I get to the bank, I might pick up another one as I intend to use this very nice one for RC batteries exclusively.
On top of that, it arrived in 1 day from Amazon. Can’t beat that.
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