I have the Periea Handbag Organizer (Chelsy model) in small and large. Both of them are useful and adequately made. I generally favor bags that can hold a lot of stuff and sometimes, it can be a real pain in the butt to dig around the bag to find an item (i.e., wallet, keys, glasses, lipstick). Also, when I decide to use a large bag, my stuff gets tossed around. These organizers help on both counts. They enable me to store the items in easy to reach compartments, and they significantly reduce movement and tumbling. I'm happy with both. I added a few photos for size comparison :)

I love my bag (basically it's a large open sack). While it has pockets on the outside, the inside has one zipper pocket on one side and 2 holders on the other side. So - all my stuff is thrown in the middle. And I carry A LOT of stuff! This little holder is not that little and it holds A LOT w/o adding any weight to my bag. I also like that it has 2 zipper compartments so I can put personal stuff in there w/o everyone seeing it every time I open the bag. I'm not sure HOW LARGE other people's bags are that I read in other reviews that they say it slides around. The length of my bag is 16" and this thing fits comfortably in it. I've attached a BEFORE and AFTER picture. Seriously, for an extra $10 I now enjoy using my $250+ bag!