Best loud portable speaker for a dance class?

I need to get a portable speaker for the upcoming dance season. I mainly care about loudness, and that it is small enough that I can get it from my car to the classroom. And one that I can connect my iPhone to with a m/m audio cable.

I have been using computer speakers, because they are loud, portable and cheap. They tend to break quickly though; I find myself replacing them yearly, probably because of touting them back and forth in a bag, which I suppose they're not meant for.

I've been looking at the "G-Boom" by G-Project portable bluetooth speaker, but I'm concerned it won't last as long because of the rechargeable battery.

So, I need something:
-Loud enough to fill small classroom. I'd rather it be much louder than you think that needs to be
-Small enough to tout from my car to the classroom. As long as I'm able to carry it it'll be good

Bose sound system is the best, I use my phone with Bluetooth with it. Bose sound system are well nown.
I'm listen to mine as I type this. Listening to tune in radio from a radio station on the inter side of this planet

You might just want to get a good, old fashioned boom box. Some of them have an AUX input that you can plug in an iPhone or anything else you might want to. Avoid Bose though. That's good advice.

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