Review on Topeak MTX Trunk Dry Bag - Black Waterproof Storage Bag (15x9.4x10.2-Inch) by Ramon Hood

Another product for use with Topeak's great rail. I bought this bag because it is waterproof. I wanted a bag to carry things with me, but not so big that it would cover the sides of a bike or a laptop. This bag is good for that. The bag comes with a decent shoulder strap but with little padding. It's easy to put on, grab the strap and keep messing around. The downside is that the belt slacks a bit and I rub the wheel (which ripped it). It must be removed or wrapped a little. Not the worst solution, but it slows things down by a few seconds. The side pocket (seen in the picture on the web) is not very useful except for keys or something thin. The interior makes for a pretty decent stuff sack. I had enough space to fit two beer farmers and I also put six packs of beer in it. I know these are probably not the usual items you would put in a bag, but the example gives a good idea of the size. Inside, it's simple: a full square storage space and a cheap Velcro divider to separate what you're carrying. Pretty expensive for a bag but it will keep your stuff dry.