PacsafeMetrosafe X Anti Theft 25L Backpack - With Padded 16" Laptop Sleeve, Slate

I was looking specifically for a locking backpack with the hidden pocket on the backside, up against your back, which this one has. I'm very happy with it. It's laid out well and a perfect size - about the largest that will fit under an airline seat. I also like that the side pockets can unsnap and expand for a water bottle, but you can snap them smaller if you want to store smaller or flatter things in them, and they don't stick out if you're not carrying anything in those pockets. I also bought a PacSafe Metrosafe LS100 crossbody for daily touring, and I love it too. The photos don't do either one of them justice.Besides its functionality, I bought the slate because it was priced lower than some other colors, and it looks incredibly cool in person. I'm thoroughly happy with this purchase.

Things I like: 1). Easily accepts my 16' LG Gram laptop. 2). Security features are great. 3). Very roomy inside and can fit a lot of stuff. 4). When the straps do adjust properly, the backpack is fairly comfortable.Things I did not like: 1). The straps would loosen up each time I put the pack on my back, then I would have to take the backpack off to tighten them up, which would loosen up when I put the pack on again. 2). Also the side bottle holders do not hold bottles securely. They kept falling out. 3). The strap on the back to fit over the luggage handle is very small and tight. Trying to get the pack on and off was time consuming and difficult which is very irritating when you are trying to board a plane.Because of the straps, I do not recommend this product.