I wanted a bag that would hold what I normally carry in my pockets and a little more, but still ride under my arm and under my raincoat. I have a Maker's Bag that I use as a day bag, but it's big for EDC around town. Basically it's about smartphones and enough other stuff in my pants pockets that it makes it difficult to keep my pants from sliding down!
So the search began: simple, small and light with room for phone, earbuds, maybe a small power bank, a Moleskine notebook, pen, glasses, a Victorinox Classic pocket knife, an LED flashlight, and a glasses cleaning cloth.
Drum roll... Travel Cubelet! I have the pleasure of living in Seattle, exacly 12 miles from the Tom Bihn factory store. I was able to secure one of the new TC's in Coyote, matching my Smart Alec and Aeronaut 30. Not only was it a good size, but it came with a 5/8" shoulder strap made of a new softer, thicker material.
I've had a few days to fiddle with it and it's a keeper. I can actually strap it to the outside of the Smart Alec using a couple single Gatekeeper clips and a long keystrap. Better yet, it makes for a "mini Freudian Slip" in my Maker's Bag. If you a truly a one bagger, this makes for a great boarding bag, keeping your phone, glasses, boarding pass and passport close at hand and secure. I discovered that I can lock the zippers to the shoulder strap using the provided zipper pulls.