Something small, just enough for a tube, tool and co2. Quite like the look of the Ortleib micro but don’t really want quick release.

The velcro road bag I have been using on my gravel bike just keeps coming loose….

Anyone tried Big Top? Other out there to consider?

I just got the Castelli one. Bought the XL and medium. The XL is a good size, the medium is going back. It’s a decent looking bag and tighter to the saddle than the Ortlieb.

BigXTop it is fantastic kit. I can’t fault the bits I’ve got.

And Jordan’s a nice guy too, so deserves the support.

Got the castelli mini one for occasional use when I need to free up a pocket and cage. Just about big enough for a tube, a tool (long thin one), co2 and a few tiny spares. I really don’t like the look of saddle bags but this one’s pretty discreet.

Simple and cheap
Got one of these on both road and MTB. Fits a tube and couple of canisters no problem, could probably fit a multitool too but I’ve not tried.
Only holds on the saddle rails (nice and tightly), no connection to the seatpost itself.

Spesh wedgies are nice, rattle free and easy on and off

Something from Wee Cog I’d suggest,probably the Slick.
Made in Scotland and STW Towers approved.
Nice people behind the business to boot!