If you need to store a few things on your bike but don’t need the space that full-on panniers or a large bar-mount bag provides the Anything Cage by Salsa might work for you.
It’s essentially a really, really large water bottle cage, made to accommodate smallish pack bags. The bag isn’t provided but a couple of nylon straps are, so you easily tie down what you’re carrying to the cage.
It fits on your regular water bottle bosses. Depending on the size of your frame and positioning of your bosses your bike might even fit two Anything Cages.
We have a few in stock at the time of this posting at a cost of $55 each.