I have a Zefal Hurricane mini pump in my seat bag. Fits in the bag nicely but it takes forever to pump up a tire. It is about 9" long. Has an extension tube that comes out when you start pumping, giving about 15" of stroke. Seemed like a cool design but I can pump away until the cows come home and still not enough pressure. I like the minimal approach to a pump and have it fit in the seat bag. Is there another mini pump that would do better. ? I am probably expecting too much from a mini pump anyway...................

Minimal approach to a pump, but extravagant approach to a seat bag! Damn, but it's a big seat bag which can fit a 9" pump!

Anyway, my suggestion would be to get a size M (8.5") Lezyne Road Drive. It's a great, highly functional pump which can fill a 25c tire to a acceptable pressure with reasonable effort.

I use them in both the aluminum and carbon fiber models, and can suggest getting the optional ABS Pen Gauge hose for them, so you can know pressure. There is a Road Drive version with digital pressure gauge built in, but it's only available in the Small size, the pumping prowess of which I cannot attest to.

https://www.lezyne.com/product-hpumps-hp-rddrive.php

Yeah it is a big ass seat bag The front strap loops around the seat post and the rear end juts out from under the saddle about 3 inches. Nice bag, heavy canvas with side pockets and has leather straps with buckles. I think I was influenced by the manly leather straps and buckles Thanks for the info on the Lezyne pump. I looked at the reviews and they are highly rated. I like the hose too, thats one issue I have with the pump I have, I have to grasp the pump head and hold it securely to the tire, its kinda hard to do after a few minutes and afraid I will damage the presta valve stem.
Thanks for the info !

Thanks for the info. Thats good to inflate a 700 x 25 or 28 like that in a couple of minutes ! Encouraging to hear, my tires are 700 x 23 so I should be able to do ok with a good mini rather than this lame mini I have. I have been looking at mini's on line and holy cow there are a ton of them out there. !

Topeak RaceRocket HP or the longer HPX. I've used the shorter HP for three years on my hybrids' fatter tires and road bike skinny tires. Takes about 200-300 strokes with the shorter HP. Great ergonomics for such a small and affordable pump. Effort is still manageable even after 200 strokes. No complaints.

I also have a newer Blackburn Core Slim, also very good except for the ergonomics -- the end caps are hard edged metal, not the rounded rubber cushioned end caps of the Topeak.

Anything smaller, might as well go with CO2.

Also these mount just behind and to the side of water bottle cages, although the Topeak also fits my jersey pockets or expandable Serfas seat bag.

Reliance on CO2 can be risky. The mini I use is so it's no longer available but there many are others like it--i.e., attaches to the frame utilizing the water bottle bracket, has a lever that locks the head onto the tube valve and pumps in both directions-- no more than ~50 pumps will get you home.

I bought the Topeak Ninja pump that stores in the seat post, haven't had to use it yet but the storage solution is great.

You don't put it in there all at once....