ok, well having got one of these for xmas, i can comment a bit better on it now. The bag itself is quite small. That may suit you or not,. As a beginner, i like it. You can fit the 450d with a 55-250 IS attached and that is literally the width of the bag. You then have room for the kit lens, and either another lens or a flash. The top of the bag can accommodate the charger and spare batteries. The All weather cover is quite cool and covers all but the back of the bag. There's no room for a tripod.
This really is designed as a small bag to grab the essentials, or just for a newbie to carry their few items. But at a £31, you can't complain!
Edit: Just spotted the 200AW has come down to £30 in the sales! Might be better for you if you have another lens or bigger flash!