Bought on sale for about $18 from BTD, incredible bargain especially if you compare it to the almost identical Rapha small under saddle bag that goes for $65.
Mine is loaded with
-Silca T-Ratchet & Ti Torque kit and bits (with homemade sleeve of light fabric and bits in a plastic holder)
-one Park TL-4.2 lever
-two 16g CO2 cartridges
-one Continental Race Light tube 700-1825c 80mm presta (folded up tight)
-PDW Tiny Object CO2 inflator (in a small ziplock bag)
-one pack of Park glueless patches
-one adhesive tire boot
-one presta valve core removal tool and spare presta valve core (in a small ziplock bag)
Even with all of the above, it's not over packed and it zips up easily. Though I could probably squeeze in some emergency cash or change, but that's about all it could fit in addition.
The Undersaddle Mini Saddle Bag is light, adequately water proof, and just big enough for the essentials a wide road tube, a CO2inflator, some tire levers, and an emergency $5 bill. The size is small enough the bag completely sits underneath and within either side of saddle. I recommend this bag to anyone who wants a reasonably priced, minimalist saddle bag.
I hate big, clunky saddle bags......However, there are a few items that every a avid cyclist should carry. Tube, inflato, co2, lever, etc. This bag is made well, looks good on the bike, and simply works.....