Not saying this is a bad product, but look at other photos and videos of this before buying. There definitely should be a small, medium, and large version of this as the actual size is huuuuuuuuge. Great product for a certain market, but please make a smaller version that would fit on the top tube in a reasonable manner.
Great solution for spare parts, tools, keys, phone, food, etc. and the uni base can mount just about anywhere. I put one on my kid's bike and use one on the top tube of my bike for extra storage.