I just bought a 1x10" Marshall combo guitar amp, and I've read in articles that many guitarists sit on their amps.
Is it okay to sit on it? Is there any chance of breaking it as a result?
I would generally say that there is no risk to your amp by sitting on it. This case could be a little different since you are using a relatively small amp but I still doubt that you would be able to break it unless you are significantly heavier than the average person. I also imagine that you would be pretty close to the ground, which I would find uncomfortable.