Very good quality, typical for Ortlieb. I like the convenience of the clamping system which makes it very easy to remove and reinstall the bag. The bag is actually quite roomy, or can be rolled up when less is more. Only minor complaint is that I like to have vents on dry bags to let out trapped air when closing the bag - this one requires some fidgeting to squeeze out the excess air before rolling the top.
use it every day for riding can store alot in it if you pack it correctly . i carry 2 spare inner tubes ,patch kit , bike tools small binoculars a snack or two and even fits my folding raincoat in it if its calling for rain GREAT PRODUCT truly does keep everything nice and dry