I purchased this bag after an extensive search to find a replacement for the vertical messenger bag I had used for travel since 2003. I felt that I was settling when I ordered this one, but I couldn't have been more wrong! This is a great bag. It is sturdy, roomy, and lightweight. It has sufficient pockets/sections for all of my standard items, plus smaller purchases, and the security features make it a nearly worry-free accessory. The only criticism I have is that the pockets on each side hold only the smaller (16 oz.-ish) water bottles, and don't hold those very securely. Regardless, I am very pleased with this bag and would recommend it to others.