Is it silly to love something as simple as a small pouch? Who cares.
So I've had my Synapse (pre-19/25), along with Matterhorn Water Bottle, for over two years now and love it. I have it with me every day here in NYC, plus I've taken it to Hawaii, Iceland, Austria, and Mexico. One common use of mine for it is for when I go running. In the summer, I'll often be walking around wearing just my running clothes, so no pockets. But I have to get around the subway and have some cash on hand. I've had the Clear Organizer Wallet for quite a while. I keep it clipped into one of the side pockets that I can access by just sliding one shoulder strap off and swinging it around slightly. All I tend to keep in that wallet is some cash, my MetroCard, ID, and a credit card. It's worked out well, though I find the zipper can hold me back when I need really quick access and the size is big enough that I have to manually work it back into the side pocket, especially since I will keep my iPhone in that Ultrasuede pocket. I've longed for a simpler solution for my what I keep in the wallet, and the Pocket Pouch is perfect. Just arrived on Wed. Some cash and a few cards fit perfectly, and I can more easily just open the pocket and pull out the pouch and have immediate access to my MetroCard. It's the little things, you know.
I still maintain, though, that the inside pocket in the main compartment of the Synapse gets in the way more than it's useful. I wish I could remove it.