I really like this bag. the pocket on the top of the sling is advertised as one for phones and it will fit most phones, but I use it for my GPS and it fits easily in there with with its carabiner and the sling/padded shoulder strap rides comfortably on my shoulder. The sling can be connected to either bottom i-ring so you can sling the bag over either shoulder. I prefer over the left shoulder as it allows me to carry it on my back and then swing it to the front with the two zippered pockets opening up for easy access to contents. The two zippered pockets have a multitude of internal pockets including a small zippered one to hold small valuables extra securely as well as a couple of pen slots.