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Clean any plastic jar with a screw-on lid, just make sure it's not too wide. If you hit it with your legs while pedaling it will be very annoying after a few miles.
Use a marker and while centering the jar under your seat, mark two spots on each side of the seat rails. Cut four small holes and pass two plastic tie wraps in there. Use quality tie wraps on your set up, unless you don't really care about losing your new container.
Strap them on the seat rails and fill it with stuff. If you want to make it completely water proof, simply add a dab of silicone over the holes for the tie wraps.
That's it. you're done. I hope some of you will find this post helpful.
Until next time, ride safe and Godspeed.
Gerry :)