I tried out a couple different backpacks earlier this year and found pgytech one go air 25L the best for me. I originally used the Ulanzi 35L for a month but it looked like a balloon on me. I also didnt like I needed to open the whole bag to get my laptop. The PGYtech is alot lighter and looks normal on my back. Also it's super easy to access my laptop without having the open the entire backpack. fits my tripod and my water bottle on both sides which I find that although most backpacks say they can do but usually are too tight to do so. Its been raining alot in California and it has kept all my gear and laptop rain free. also had it on dust and sand before, it was all clean with a wipe!
