We recently took this camping to the coast of Washington state. It held up admirably and didn't allow any of our clothing/gear inside get wet. It withstood being in the back of a truck getting rained on over 3 days and everything stayed nice and dry. The only reason for 4 stars is the zipper opening is pretty small. It was hard to get much stuff in as you had to put items in and then arrange them in the bag; one by one. I suspect the smaller opening lessens any moisture getting in there though. Also, the zipper is heavy duty, be sure to grease it with the included grease as it can be tough to open and close.

We purchased this to use as a bag for our Burley Travoy cargo bicycle trailer. It?s perfect! There are great tie down spots in the right place. It is truly waterproof. Even air doesn?t escape when it is zipped up. There are no compartments inside the main zipper.

The only issue I could foresee is that the zipper opening might be a little small, if you are trying to put something big inside. It?s perfect for clothing, shoes, etc. It has about a 15? opening from end to end. The price can?t be beat for equivalent bags. We can?t wait to take our first bike pack trip!