I was attracted to this bag because of its looks. Although I checked its measurements, I had a little doubt on whether it could actually fit my daily essentials; it surprisingly did! As you can see from one of the pictures, everything fits snugly into the bag without it looking like it's bulging out. I don't really bring my 13" laptop with me often but when I do, I like to bring all its accessories with me, including the charger, in its laptop bag. This laptop bag can fit in & still allows me to zip the leather bag nicely without straining the zipper. FYI, my water bottle is a 1L water bottle. And the bag can fit a 1.5L water bottle too although I would advise against that; I don't think the shoulder strap can handle such weight plus the added weight of other things that would be stuffed in it. My only gripe for the bag is the lack of pockets in it. Other than that, this bag is perfect! Thank you, Piel, for making such a wonderful bag~