Review on Durable Laptop Backpack: Water Resistant Anti-Theft Bag with USB Charging Port and Lock - Slim Computer Business Backpacks for Women Men - Fits 15.6 Inch Laptops - College School Student Gift by Caleb Eichbauer

This is a good bag and the added security of being able to lock the main zip that holds the laptop is good but only good in a controlled environment to keep people out. Otherwise you can expect someone to cut open the bag. Pro - has two side pockets for smaller water bottles; I have a large bottle that doesn't fit me. Multiple zippered compartments for storing various small items. External headphones and charging are nice additions that I haven't had a chance to try yet. Cons - The small outside pocket needs to be deeper or whatever you have in it will fall out when you open it. The next size bag only has one zipper so you have to zip left to right to open it and vice versa to close it. The two inner pockets can be deeper. There's a strap on the side to hold what looks like a large water bottle with a loop; however, it can be easily removed. Overall I'd say this is a decent bag for small items if you're traveling and don't want a lot. I can fit a small 13-15 inch laptop, a 1 inch laptop, a 5 theme laptop and maybe more. I'm not sure if a large laptop will do.