The camera in question is a consumer video camera. A Canon HG20.
This being a consumer video camera, there are no huge EF lens to carry about. At the moment I have just 2 batteries, 1 tripod QR plate, 1 SD card reader for easier access to comp, and 1 microfiber cloth to carry about. I would want to have spare space to be able to carry the AC-DC adapter as well as for (hopefully) future acquisitions - I would hope to get a microphone (& its related accessories, e.g. shock mount + cable) and a (37mm) macro and tele lens.
As for a tripod (some Manfrotto 055C obtained from somewhere), I don't think its feasible to use the same camera bag to carry it.
Thanks for all the advice.