Here's my toploader, with a Lowepro softcase secured to the side, which stores the lens not used. I keep the Canon EF 70-200 f/2.8L IS USM on the camera most of the time:

Has a nice strap that has a sticky material that keeps the bag on the shoulder.

The toploader with the listed items leaves little room for an external flash and the front pocket leaves little room for filters and much else. I store the flash card wallet there. The somewhat bigger bag keeps everything, so when I go somewhere where I need multiple lenses and accessories, the Nova 5 goes with.

thanks to Brian Hughes  for photos and comments.

Review #2

note: some images below maybe unsuitable for children or people with a nervous disposition  

Are you looking for a small bag but are worried about not having enough space for extra lenses? Don't think a backpack that you have to take off every time you want to get at your camera is the only option.

You may want to check out the Lowepro Toploader 75AW. This is a very slim yet versatile bag. It consists of a deep main compartment, with a two way zipper on the top for very easy camera access and a front cargo pocket that can be made into two sections and accessed from the top or bottom. The AW in it's name stands for All Weather as it has a rain cover that straps over the top zippered area to prevent leaks. The great thing about this bag is there are two carrying methods, shoulder strap or Chest rig (included)

Now I know your thinking dam, I have a long lens or lenses where the hell am I gona put them? I must need a larger bag… Nope!

Though the bag is small the dimensions are deep and wide enough to hold a professional SLR body with grip even when coupled to such lenses as the Canon EF 70-200 f/2.8L IS USM or Canon EF 100-400mm f/4.5-5.6L IS USM (hoods reversed) or two smaller lenses. There is a slim area beside the length of the lens for accessories such as a blower or off shoe cord. The top lid has a zippered pocket to hold media and lens cloths. While the front cargo pocket is large enough to hold a pro flash and a few other items.

Sounds good but I have multiple large lenses that I just cant go without.

This is where the versatility of the bag really comes into play. Use of lens cases (sold sep) and the Slip Lock system allow you to up your capacity to a Pro SLR body + three large sized lenses or water bottle.

My kit that I fit into this bag:

Canon EOS 20D + Vertical grip
Canon EF 70-200 f/2.8L IS USM with tripod collar
Canon EF 24-70mm f/2.8L USM
Canon EF-S 10-22mm f/3.5-4.5 USM
Canon 580EX Speedlite
Charger
Extra battery
Off shoe cord2
Remote switch RS-80E3
cleaning cloth
extra media
tripod mounting plate

lenses not on camera sit in lens cases models 4 and 4s

For a night on the town the lens cases are removed and it is used with the shoulder strap. If I am out on a serious photo mission the chest strap is on and the top lid zipper is undone for rapid camera access.

Pros: All of the above. lifetime warranty, Perfect bag for someone using a wheelchair.
Cons: Base padding could be a bit thicker , The chest strap is a little hard to get off your body.



Price: bag: $90 CAD lens cases: $20 CAD (each)

Thanks to Picture-This  for photos and comments.

General shots of Toploader 75AW

thanks to jhom (Jim Hom)for pics

Review #3

Photo contains:
Canon EOS 20D

thanks to Kalli Reuss for pics

Review #4
(Added 18th Jan 2007)

Lowepro TopLoader 75 AW with a Canon EOS 30D/BG-E2 Battery Grip/and Sigma 70-200mm f/2.8  attached.

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There is still plenty of room to spare!

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Canon EOS 30D/BG-E2 Battery Grip/Sigma 70-200mm f/2.8 .

Thanks to Anthony Skorochad for photos