This extremely durable case was developed with the help of EMS professionals. Fire rescue personnel tested earlier versions of this product in real life situations, and their feedback enabled us to improve the product both structurally and ergonomically. Some of the prototype cases broke when subjected to rough handling. We examined the areas that fractured, and then redesigned those areas to strengthen them. We tested the new version by loading the case with 40 pounds of content. Then we had a strong employee throw it upward as high as he could, estimated at around 10 feet high, and it landed on our concrete floor. He did this several times, and the case did not break! To say that our case is durable is an understatement. It is probably the strongest waterproof case in the world.