Cat_UK is on holiday but I can answer for her - she has the regular sized one (as do most people). I don't think any of us have the large Bays (called the Piccadilly). The Large one is an overnight bag rather than a handbag.
There is (in order of size largest to smallest) the Piccadilly, Bayswater, E/W Bayswater and the Ledbury. You should be able to see these on the Photo Reference Thread.
There is (in order of size largest to smallest) the Piccadilly, Bayswater, E/W Bayswater and the Ledbury. You should be able to see these on the Photo Reference Thread.