I have both the 25L for trips and the 12L for every day. Both are excellent bags, water proof, solid. Not bulky like a backpack which is one of the reasons I purchased. However I feel the 12L possibly should have been 15L in order for it to be a little deeper (more square base) in order to navigate better inside the bag. When I have my laptop in it’s pretty tight to fit anything not slimlined in there with it. Without the laptop sleeve it’s more roomy inside. Other than that it’s a fantastic bag.