I was very disappointed at the size of this fanny pack. It's probably half the size of most fanny packs I've seen. The spec says it's 8" x 3.5" x 2.5". But note the 8" is overly generous as it measures the widest points where the belt attaches to the pack. From top to bottom, the pack tapers in to a width of 5" and that is a more accurate measure of its effective width.