The base is about 16" x 9" - I don't have the shoulder strap of the plastic parts case that originally came with it, but it's still a quite useful bag if you have a bunch of tools. It's been washed and is clean.
Here is a site with more info about the bag. https://www.acmetools.com/clc-25-pocket-16in-tote-bag-with-top-plastic-tray-1534/084298015342.html
Cleaning out the garage, so posting several things, see my other items by clicking on "more ads by this seller" on this page.