I own many different Bluetooth speakers, but there is just one that I carry daily in my backpack. That's the JBL Flip 3. It is rugged and water-resistant, surprisingly loud and crisp, and has great battery life. I paid $100 for mine a few months back, but now you can pick up a refurbished Flip 3 for a whole lot less. HarmanAudio.com has them on sale for just $69.99 ($85-$99 new on Amazon) in your choice of black, blue, or red.
If you want a little more oomph and rumble, you might also consider a refurbished JBL Xtreme, the Flip 3's muscular older brother, which Harman is selling for $209.99 ($249-$265 on Amazon). It's also available in black, blue, or red.
Even though the speakers are refurbished, they still come with all the original accessories and have the same length of warranty a brand new speaker would. I'm not the only one who thinks highly of these devices, Cam loves both of them as well – you can check out his full review here (I'll miss you bud).
Economy shipping is free and no sales tax will be charged; the price you see is what you'll pay. Follow the links below if you want to pick one up for yourself.