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I got older model (Trekker 200) for years and I cannot say anything bad about it. The only problem I see with models you chose is weight and limited number of lens you can take even if they look bigger than mine.

the trekker doesn't have an extra area for gear storrage and doesn't have a side access spot for lenses which means you have to set the bag down in the snow / rain to get at your camera..

yeah, that isn't such a dumb idea.
My backpack has two little rings on the straps so I could potentially use those as well.... hmmm

what is the full name of the S&F chest pack you have?  perhaps i can find it on ebay.

as for a chest harness ... what do you mean about the deluxe harness
one like this
http://products.lowepro.com/product/S-F-Shoulder-Harness,2028,32.htm
??

It looks like the one you have is the only one with clips on the shoulders.. the others just have loops?!

I tried that, but didn't like how the camera bag was secured in only two places - although there was no way it could ever fall off, it was too free to bounce around. The chest harness secures it in four places, and you can easily adjust the tension and positioning to suit what you're doing (e.g. wear it lower and looser for hiking, higher and tighter for skiing).



It's an S&F Specialist 85 AW. It has a very good detachable shoulder strap (much better than on their cheaper stuff), a detachable waist belt, and adjustable interior walls (just like their backpacks). You can also get "SlipLock" cases for it. The SlipLock case attachment points (on the outside sides of the bag) are great for holding stuff (fleece, shell, hat, gloves, ...) if you get too hot.



Yep. I've tried both and prefer the cheaper one. The more expensive one looks quite "camera geeky" and was too padded to wear with anything but a small daypack. If your backpack provides for it you can attach a couple of straps from the shoulder tensioning/weight transfer point to take some of the load.

The Lowepro Primus is a great bag. I got one about 5 months ago. Its very well made and super comfortable. I carry a D80 with lens attached plus two other lenses and a flash in the camera compartment, a big telephoto lens (wrapped in a towel) in the main part of the bag along with gloves, hat, lightweight waterproofs and there is still a little room for more. In another compartments I have maps, tide tables, a compass, spare memory cards and batteries and a quite a few other bits and pieces. On the outside I carry a large water bottle and a tripod. The tripod carrying system is very good even with quite a heavy one.

I find the camera access pocket difficult to use, so I don't, however, with the waist belt on you can slip off the shoulder straps and slide the bag around to the front of you, you can then access everything in the camera section without taking off the pack.

All in all it's a very well thought out pack with plenty of useful features, strong and very well made. I'd score it 9 out of 10.

Yeah, I should go and try a few things out.  I like to buy from BH photo in the states often... and no trying online

I guess I will have to get my butt off the computer chair and go out to a store.

I have a LowePro Fastpack 250 and it's okay. I would strongly suggest going to a store and trying one out before buying it.

Some stuff bugs me about it but the shoulder straps constantly feel like they're falling off the edge of my shoulders which drives my nuts. 

this one i checked out today I don't think would.  It doesn't stick out very far on the chest which is nice.  If you had a long lens it might start to hit your legs unless you sinched it up really high.  I wouldn't get any longer of a holster than the '20'