Pump recommendations: jersey pocket-sized for tubeless set-up

I use Specialized airtool MTB pump, not the mini. Has an easy frame fit mechanism or you can put it in your jersey pocket. It's the best pump I've had (that relaistically fits in a pocket) and bought a second one which was the newer version in black that is shorter but slightly wider/bigger capacity.

4+ years riding tubelss and I STILL carry a spare tube with me just in case, alhtough I've only ever needed it when a ride buddy used up both his spares on one ride and then got a third punture. Then I've also got a cheap 'anchovy' type repair kit in my saddle pack and a Lezyne Pressure Drive pump (with the hose) fixed behind the bottle cage on the seat tube so it's nicely tucked out of the way.

I don't run tubeless, but I do use the Topeak Race Rocket which fits the bill for portability, valve attachment and also comes with a valve core remover.

https://www.topeak.com/global/en/products/mini-pumps/333-racerocket

I have two 'carry along' set ups ref tubeless. 

1) Normal local'ish distance stuff = 1x CO2 & inflator head, 1x Small bottle with about 20ml sealant in, 1x Value core remover.

2) Longer more self-sustained stuff = as above but, I'll swap out the CO2 for a small pump and include 1x Set of tyre Worms.

One day I'll get a dynaracer kit.. but for now the genuine innovations cheaper set of worms will do. 

The one blow out I've had to fix with a worm so far I used my Leyzne Pressure Drive it seemed to work fine and I carry it in my pocket.

I carry CO2 with me just in case the tyre unseats itself as a hand pump will never reseat it. 

I also take a hand pump to reinflate the tyre as CO2 can force the sealant out of the hole that it's just plugged up. I use this tiny little thing which does work well despite it's size:

https://www.giant-bicycles.com/gb/giant-control-mini-pro-pocket

I've given up taking a tube with me now as I've been able to carry out repairs with tyre worms which took far less time than changing a tube. This means I don't need a saddle bag and carry less than when I used tubes, I must say this has been quite liberating. 

hi there, i've used CO2 for a couple of years with tubeless and it's been fine. 

BUT, i must admit, I tend to put a tube in when the hole's too big to seal...the plug things are fine, but can sometimes be a right PITA!!

I've heard about issues with CO₂ causing the sealant to polymerise (i.e. set into little rubber balls) and from what I can tell it looks like it's a problem with the cold temperature of the CO₂ as it expands. To minimise the issue, put the valve at the top of the wheel so that the sealant pools at the bottom and hopefully the CO₂ isn't as cold when it reaches the sealant.

I've had issues with CO₂ when I've had a large cut and the sealant takes a while to seal or doesn't fully seal, so I always like to have a mini pump as a backup.

I've got the iPump Twist which is stupidly expensive and light: https://ipump.jp/#iPumpTwistClass

What I like about it is that you have a tube connecting the pump body to the valve, so you're less likely to break the valve whilst pumping (I wish more mini-pumps had that kind of thing) and I was intrigued by the over-the-top carbon-fibreness of it.

If you're in the mood to "waste" lots of money, then I can recommend the Dynaplug Racer tubeless kit - works really well and is in a conveniently small package: https://www.amazon.co.uk/dp/B07MH9K4NR

You can get other tubeless kits for less money and as far as I know they all work in more or less the same way.

Personally, I carry a spare inner tube as well for those times when your tyre gets a bigger (>5mm) cut in it and won't seal. However, that does mean that you end up carrying the same amount of stuff.