Bag itself measures approx. 12"x5"  with two zipper compartments & the biggest compartment has a mesh divider along the back.

Adjustable belt is stretchy -- kept loose the waist circumference extends to up to approx. 39.5" (more with stretch). \

Note: this is a money belt that is designed to discreetly fit under clothing so that, for example, your valuables are hidden while you travel. It is a similar idea as a fanny pack but fanny packs tend to boldly display on top of your clothing.