Upload & Sell: Off
I tried for many years to cling to the idea that there was a "perfect" camera bag (first a Domke F2, then Billingham 335), but I now subscribe to the idea that an ideal bag is one that suits a person's current shooting patterns, lifestyle and equipment. Consequently I have a bunch of bags and regularly cycle through them, selling some to buy others. I generally have about four camera bags at any one time and over many years have owned camera bags from Domke, Billingham, Lowepro, Think Tank, Kinesis, Timbuk2, F-Stop and Crumpler.
I bought an F-Stop Guru last year, for example, because I needed a versatile backpack for transporting camera and other gear around Europe. Now, however, it sits gathering dust and I'm not sure when I'll use it next. But am not sure I want to sell it, just in case. Meanwhile, I seem to use my Think Tank waist pack(s) most often now, keeping two different sizes depending on what I want to carry. A larger Crumpler (New Delhi) has drifted into use as a computer/travel bag (replacing a Think Tank UD50) and hasn't seen a camera for years.
I still like the idea of a flexible and well-designed backpack that can be camera bag and/or regular backpack, but all on offer seem to be too much of one thing or another, or too big/small. In other words, there is no perfect bag!