I have the 76 Projects Little Piggy with a pouch on one bike and it's good, although the pouch looks a bit messy with the roll top. For my new bike I could go with the same again, but just checking on options. I've seen Canyon have a bag that fits bottle bosses and also Syncros do too, although I fear the Syncros mount may become rattly over time. Any user experiences or other options? Would need to fit a 29 tube, tyre levers and multi-tool.
https://www.syncros.com/global/en/product/syncros-quick-release-400-frame-bag
I have a Little Piggly and think its a good solution even run on the underside of the DT.
That said I have recently gone back to saddle bags - specifically one of these (and a couple of saddle rail mounts):
https://www.cyclingweekly.com/reviews/bike-accessories/ortlieb-micro-saddle-bag
I've not found mine to rattle and its fits everything I need; CO2, tube, tool, plug kit, latex gloves.
Also dropper post safe too.
There are a couple of Fidlock options that I'd be going for for the versatility - bag/bottle etc
Was about to recommend Fidlock, as above
I've got the Fidlock one (bottom one) and it's been fine for the last two years, holds a tube, multi-tool, small tubeless repair kit, spare link and one of those tyre lever/chain pliers type thingies.
Does the Fidlock not rattle when on the underside of the top tube? My Fidlock bottle is fine on the topside of the downtube, but has become rattly when under the top tube with the weight hanging down off the magnetic holders.