I recently purchased a Lowepro Inverse 200AW and got to give it a good test last weekend. I was a little disappointed with how it performed. When loaded it had a tendency to flop outwards making it awkward to get anything in and out of it. It would also get crushed at the bottom so that you would have to force back in. Yesterday arvo I made a couple of modifications that have fixed those issues.
1. Cut a solid 5mm thick plastic base and covered it in soft material. I know its a terrible photo but it shows you what I did (i think)
2. I anchored the bottom of these two adjustment straps to try and the bag flopping out. This worked but some 'flopage' was still present.
3. I moved the top straps anchor point higher on the bag to the flop totally.
Now I have an easy to use bag that puts minimal strain on my back.