I got this because I had 3-4 brushes I wanted to keep safe when I traveled, and it has worked perfectly. Inside on the left there is an area to stash brushes with a fold over cover, on the right is a small zippered section that you can put makeup removing wipes in, and there is a central detachable portion that is for storing makeup. To give an idea of size, I can fit the following items in there and it only bulges a wee bit: NARS Pure Radiant Tinted Moisturizer Broad Spectrum SPF 30 ; NARS Radiant Creamy Concealer, NARS The Multiple; NARS Light Reflecting Pressed Powder; NARS Eye Palette (Ride Up To The Moon), and a NARS mini bronzer.
The bag is fairly large, and can fit most full sized products. I tend to travel with setting spray and primer and a few extra lip colors, and those sometimes don't fit in the detachable pouch, but they do fit within the entire bag.