My equipment seemed to be stretching the 200AW a bit and when I got the Sigma 20-40 f/2.8 lens, I knew I wanted a bigger bag. Since I liked the 200AW for its ease of use, I decided to upgrade to the 300AW.
Intial impression on getting the 300 was that it looked huge compared to the 200AW. There is loads more space in the main compartment as well the front and top compartments. However, when I put in on my shoulders it just feels like a small backpack. Even though the shoulder strap is well padded, I feel that (as indicated by several reviews/comments here) extended use of this strap will give one a back ache. However, the waist strap seems to be very sturdy and I think using this during long distance hikes/walks, will ease the weight on the shoulder strap and (hopefully) there wont be any strain on the back.
Without mach ado ..... a few pics
First - the Slingshot 200AW
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How I had loaded my stuff in it
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The Slingshot 300AW
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Side by Side (obviously the bigger bag is the 300AW )
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How I load my new bag
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The other 2 compartments take all the other stuff like rocket blower, extra camera battery and charger, AA batteries, Remote flash trigger, remote trigger, control for remote trigger etc. and still have loads more space.
Hopefully this is useful to someone.
The floor is now open for questions .....

If I moved a few things (as shown in 200AW setup pic) I would be able to fit the 20-40mm lens but would have had no way to get the S3IS in there - with proper padding that is. 

