As a reference point:

I have a Tumi T-Tech Presidio (no longer produced by Tumi)

http://www.amazon.com/Tumi-Presidio-.../dp/B004RS3YZY

with dimensions as follows:

14"W x 22"H x 8.5"D

It perfectly fits (e.g. no wiggle room once it's in) and only if I put it in the sizer at an angle then drop the rest in (it will also comes out without too much effort using the same angling method). The depth of my bag is actually around 9" - 9.5" because my toiletry bag bulges out the front panel of the bag)