Select Blackburn Category Group
I chose this because it's big enough to hold a minipump (as well as spare tube, tubeless repair kit, tyre levers and a few snack bars), adds visibility at night (it's reflective) and has a clip for a light.
On all-day rides I put all the repair type stuff in the seatpack and then use a bar bag for convenience items - snacks, wallet, light layers. On shorter rides I skip the barbag, the seat bag is big enough.
The zipper can be a little stiff, and I didn't find the interior separator useful, it's easy to remove (just velcro).
I bought a 2nd seat bag for my 650b bike so that I don't have to switch out the spare tube when swapping it to/from my 700c bike. I've had the first bag for 2 years, it has travelled thousands of miles and it's still in good shape.
Worked well on a six-day bikepacking trip. The bag is lightweight and high quality, and it's nice that it's totally separate so you can pull it out for packing. The metal bracket and bag holster allow this to work with a dropper post. Note, however, that the instructions say not to use with a saddle that has carbon rails. Saddles with carbon rails often have a shallower angle on the back part of the rails also, which doesn't work well with this. The whole thing weighs quite a bit more than a simple bikepacking seat bag, but it's still relatively light. It was plenty stable and I found it fairly easy to set up.
This is the only bottle cage that will actually hold onto bottles in rough singletrack. They work best with the standard specialized bottles as the hook is designed to clip onto the top middle edge of the bottle. Be careful not to overtighten the bolts or you will dig into the soft plastic.