I was going to offer up a Jawbone Jambox.. just found out they went out of business..
I've had a Jambox for years its great for tossing into a bag and bring it wherever..
I also have one of these
https://ecoxgear.com/shop/ecopebble-lite/
It floats.. you can toss it in the pool and chill
Finally one from kickstarter, I use it for a computer soundbar.. The company tanked soon after it delivered the speakers..
https://www.kickstarter.com/projects/1468373648/quarterwave-bluetooth-transmission-line-speakers-0/description