Made just for smaller bikes like the TTR125, XR 80/100, 80 cc MXers, the DBG Minibike bag is also a perfect fit on a full size bike too if you want to carry just a few things.

Features

6" long x 4" wide x 2"high. Big enough for a plug, spark plug wrench and a few other tools (or a candy bar!) but small enough to fit the bike and stay out of the way.
double stitched Ballistic nylon, the same material as the larger bags, with a Cordura flap.
1 compression strap with Fastex buckle and sliders.
bolt securely to your bike with very low profile mounting hardware, included.

Minibike Bag - $23