I purchased a navy Brain Bag a little over two years ago, and I did a pretty detailed review of it soon after. My positive feelings about it haven't lessened at all over the past 24 months. During the school year (I'm a professor), I use it pretty much every day as my main -- and usually only -- bag, and I've also used it as a travel bag on short trips. I continue to be impressed by how much it can carry -- any limits are usually dictated by how much my back can take, not how much the bag can hold. I teach in several different locations, and I typically have a laptop and accessories, an ipod, two or three large paperbacks, maybe a textbook, writing pads, DVDs, markers, several folders full of student papers (in a Freudian Slip), and lots of other odds and ends. With all that, the bag is maybe 1/2 or 2/3 full, so there's always room for more when the situation requires it.
When I first bought the Brain Bag, I'd wanted it in a brighter color (plum), but I just missed the last batch. So I got navy, which I liked a lot, but I still always kind of wished I had something that stood out a little more. When I saw the indigo bags pop up on the site recently, I immediately liked the color, but I also knew my Brain Bag was still in great shape -- I couldn't justify buying a new one. But then I decided to try to sell my navy one on eBay and buy a new indigo one if I got a good offer. After all, my bag still looked almost brand new, even after being used daily for two years.
So that's what happened. I sold the navy Brain Bag (for a price that I think made both me and the buyer happy), and now I'm carrying a new indigo one. This couldn't have happened, of course, if Tom Bihn bags weren't so fabulously well made. Most two-year old bags would be hard to give away. But mine was in excellent shape -- partly because I took good care of it, but mostly because it's a tough, amazingly durable bag.
I'm liking the new Brain Bag just as much as I did the first one -- my only problem with it is that on occasion it's just a little too much bag for what I need. To remedy that, I have a Synapse on pre-order -- in plum.