Small, affordable, loud speakers that can connect to an iPhone?

I'm looking for a small portable speaker that would be good to place on a bike (I have a place to put it already) thanks.

Check out the JBL Flip. It's a bluetooth speaker so no wires. It's surprisingly loud. I have a Jambox, which had long battery life and excellent quality of sound. I got my kid the Flip, and while it was roughly $100)l half the price (About $100), it's much louder. The battery life isn't as good, and the overall quality not quite as good, but on a bike you own't notice. Look around for deals on it, it's amazing loud for the size.

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