When it comes to backpacks there is only one brand I use, Shimoda designs, I have used many bags but for me, this is the best bag I used to date, I currently use the Shimoda Action x 50, it is a great bag for hiking and photography at the same time, it always travels with me and I never had to check-in, the size is just the right size for the overhead compartment on a plane. I take this bag everywhere and its the perfect size for me, due to the fact you can roll the top the bag can be bigger or smaller depending on what you are carrying, I also love the fact that I can regulate the shoulder straps to fit my size, the bag is waterproof and very resistant.