The one picture shows the main compartment's external dimensions (8"x9.5") but that doesn't really tell you what the internal dimensions are-- just to give an idea that compartment is *just* large enough to fit a 6.75"x9.5" tablet. That measurement was important to me because I wanted a sling bag to hold and carry an iPad to and from the pool while we were off on vacation. This one works for that with thickness to spare (in case I wanted to fit both an iPad & an e-reader, for instance).
The bag is light-weight and sturdy. There's no locking measures, in case you're wanting to make the bag pickpocket-resistant like some sling bags support. I like all the extra pockets & velcro straps that allow you to keep things from sliding around when needed.
It's a reasonably attractive bag, and comfortable to carry on the shoulder or cross body.