Lezyne

Micro Caddy-M MTB Seat Bag

Very good pack for essential spares. Keep in mind it is not designed to hold your day's supplies, but rather be a tool chest for your emergency repair kit. You MUST re-wrap your inner tubes correctly if you want to have any hope of them fitting in (lots of tutorials on you-tube on this if you're not sure). I am able to fit in a 47c Tube (correctly wrapped and secured), 20gram CO2, CO2 chuck, tire lever, 10 small zip ties (taped to the tire lever), and a standard Dynaplug "carbon ultralite" tubless plugging tool in the main compartment with a crank brothers m19 in the external tool pouch. All of this is a very tight fit, but that is by design as you don't want anything rattling around (annoying sound not to mention it wears out your stuff). The large velcro cinch strap that holds it on your saddle has great velcro (super secure) and allows you to really cinch it to the saddle (even if partly full) so that there is zero "waggle on your saddle" ... =) Best part ... the bag is narrow enough that it does rub my thighs. This has been a major problem for me as I use a 135mm saddle and every other bag that is large enough to hold a proper tool kit is too wide and rubs. This one, does not. I hope they never stop making this bag, it is pretty much darn near perfect.