Just went to one of our local bigger camera stores for a browse, and although I already own a few (my wife would say several) bags of varying types, I saw one that I had never seen before.
It was a Thinktank Rotation 360
This rather innovative bag allows the waist belt part of the bag to rotate around out of the bottom of the main backpack. The various bells and whistles that go along with it are also quite innovative, like attachments for the camera straps so they attach to the backpack shoulder straps instead of strangling you around the neck, for example.
Professional photography equipment - camera bags, camera cases - from Think Tank Photo
Be sure to click on the "Features" picture at bottom left, then just click on the "Next" button to your heart's content. There are a LOT of features!
Check out the various features - I must admit that I have an inbuilt skepticism for useless "features", but I actually found this very comfortable when I tried it on, and the swing-around waist pack worked brilliantly well.
It is not oversized, quite slim (good for bushwalking), doesn't weigh too much itself, has attachments for adding stuff like water bottle or extra lens holders, looks great, has complete raincovers for both the main backpack and the separate waist pack, and appeared to be superbly well made. Everything reeked of high quality.
I imagine that one would put the most-used stuff in the waist pack, and the other stuff in the upper compartment of the backpack proper.
I can feel another bag purchase coming on here - this may just be the ideal walkabout bag. I'll give it a bit more thought, and go back and try it on with some gear in it, before buying, but I'm tempted,.......
Now - some suggestion has been made that backpacks in general tend to be hot and sweaty to wear.
I live in Brisbane, Australia, where it can get VERY hot. It also gets very high humidity in the wet season (our summer, January/Feb).
But this Thinktank has "airflow" cushions and padding on the part that fits against your back for that very reason.
Next day:
Now I have to come clean - I just returned from the camera store, after taking a bagful of gear with me, to try out the Rotation 360 in a real life situation. I filled it with a Pentax K20D, battery grip attached complete with Manfrotto baseplate on it. I have the Tamron 18-250 lens on the camera. Then I filled the waist bag with a Sigma 10-20 zoom, Pentax DA35mm and a Pentax DA15mm. I also shoved in a Lens Pen and two spare batteries.
Then I loaded the upper part of the backpack with a Tamron SP90mm Macro, a Pentax 31mm Ltd, a Pentax 50mmf/1.2, and my Mecablitz AF-58 flash unit. Still room for more stuff really. I then added various bits and pieces into the pockets front and sides, slung the thing on my back, and it felt REALLY comfortable.
I changed my Pentax camera strap for the Think Tank one that comes with the bag, then hooked the rings on that strap onto the clips on the bag's shoulder straps - WOW! What a difference. Suddenly, no more "strangling" or weight from the camera strap around the neck.
I didn't try loading a tripod onto the tripod holder - I'm sure it would work just fine.
I then tried all permutations of swinging the waist bag around, left, right, all the way, part way, back into the backpack, lock it, unlock it - all went perfectly without a hitch.
End result - I'm now the proud ownder of the Rotation 360 I just brought it back from the store (left all my gear in it) and this afternoon, I'm hoping to go into the city for a bit of a walkabout to see how it all works out.
But so far, this really does seem to be the best walkabout bag system I've ever come across. I may look into getting one or two of the addon components that can be hooked onto the "rails" on the belt sides, but maybe that is making the whole thing bigger than it needs to be. Currently, it is very slim, doesn't catch on anything when walking past or through, and is extremely comfortable.
So far, my impression is extremely positive
One week later:
The price of the Rotation 360 we pay here in Australia is not cheap, granted, but for me this is turning out to be the final bag in my search for the perfect backpack setup. So the price will be long forgotten while I'm still appreciating the bag in a few years time. I received my belt modules yesterday, and while there is only room on the belt for an extra couple of modules at a time, at least I can now carry my big Sigma lenses when I need to (I have the 50-500 Bigma, the 100-300, and the 180 Macro - all physically big lenses).
I currently have my Metz AF-58 flash unit in one belt module, and the Pentax DA*50-135, complete with lens hood, in the other. If going bush, I can also add two more of the modules onto the side of the backpack itself (eg the water bottle carrier and another lens module) and they are attached up high, which is the best place for the weight.
I went for a walk over a few hills yesterday evening with the whole setup loaded up - probably about 7 Km - and it was very comfortable indeed. The load I was carrying included the following:
Two K20D camera bodies with battery grips, one with the Tamron 18-250, the other with the Sigma 10-20 (each attached to the backpack shoulder straps), DA15mm, DA31mm, DA35Macro, FA50mm, DA*16-50, DA*50-135, Tamron SP90 Macro, Tamron 1.4x TC, Sigma 100-300, Sigma 180 Macro, Metz AF-58 flash, Full set of Cokin filters and holders (ND, ND Grad, Polariser, stepup rings), Raynox 250, 8 spare Eneloop batteries, 4 spare Pentax camera batteries, Giotto Air Rocket, assorted odds and sods, Manfrotto 190 tripod with ballhead, and a full water bottle.
Obviously I wouldn't be taking all that lot on most walkabouts, but I loaded up just for the test walk to see how the bag performed.
As for the dry weight of the bag - it is not heavy, especially compared to my Lowepro Vertex 300 AW, which weighs more and is nowhere near as comfortable.
And no - I don't have any connection with the company, just in case you're wondering