DerBlue 2pcs Fireproof Explosionproof Lipo Battery Safe Bag Lipo Battery Guard Safe Bag (185x75x60mm)

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I was looking for lithium ion battery storage for my concentrator batteries when flying. There are FAA rules for making sure the batteries are stored safely in carry-on baggage. I was not sure if I could fit two extended size batteries in these because the dimensions were not exactly a match, but because of the velcro closure I thought there might be a few mm forgiveness. They worked perfectly. With these two battery storage bags I can bring four extra batteries on the plane! Thank goodness for velcro.

Why did you pick this product vs others?: Fits Anker 737 Power Bank perfectly! Great for packing for airplane travel. Good stitching. Feels sturdy.

The material is fire retardant but flames and debris can easily escape these bags. If these Derblue battery bags are used as a second layer of protection inside a bigger battery bag that has a zipper I would give them 5 stars and say they're good bags for that purpose. I gave these bags 4 stars for my intended use of them though because one of the two battery bags I received has bad stitching on one of the front corners of the lid. These are good battery bags however, if they were to be used by themselves for charging or storage I would only give them 2 stars because they only have a large velco strip across the front to hold the lid down but they do not have a zipper. If a battery caught fire or exploded, the flames and debris could very easily come out both sides of the top of these bags and catch something on fire. If you have these bags in a backpack or in the back of a vehicle, a 2 or 3 cell battery could possibley work its way out. If you have small 1 cell batteries in these bags they could definitely fall out. This Hobbymate battery bag is the perfect companion for these Derblue battery bags. https://www.amazon.com/dp/B07521JTLP/ref=psdc_2234135011_t3_B01GCHBQJS 2 to 4 of these Derblue battery bags fit perfectly and snugly inside this medium sized Hobbymate battery bag. Each of these Derblue battery bags can hold 2 MJX Bugs 2 batteries, but for safety, LiPo batteries should be charged & stored separately so I recommend putting only one battery per bag. One MJX Bugs 2 battery fits perfectly in each of these Derblue battery bags. I will be buying another pair of these Derblue battery bags so I can safely & securely store 4 batteries in the Hobbymate bag. I hope this doesn't appear to be a bad revue because I do recommend these Derblue battery bags as a second layer of protection.

Perfect fit any size fits pretty much great material light weight, amazing color well made easy to use... strong material strong Velcro... satisfied customer..