Wow! You have given me a lot of good things to consider. The CO2 cartridge I am carrying is 15 years old, so I should be looking into more cartridges or a pump option. I'll have to study my options.

I'm looking at the line of Aliens, thinking the RX should have all I need. I've got the spare tube (new), and some really old patch kits, but I don't carry them right now, because I don't have the room.

Since I'm thinking about a cell phone, and looking at what others are carrying, I'm looking at the topeak medium aero wedge. It's expandable, which makes for some options, and hopefully it won't be too big (it's hard to tell from a pic of only the bag). It's a little hard to tell how it attaches, but it is supposed to be easy, and since I remove my bag for transport, that's a good thing. It sounds like it works for Da Tinker.