Any recommendations for a waterproof MP3 player that can connect via bluetooth to a waterproof speaker?
(not a cell phone....that will be in a separate waterproof bag protected from shock/harm)
I have a couple ECOXGEAR speakers. They are fully waterproof and even float if they end up in the water. I have an Ecoxgear Pebble cube that is only 2.5" x 4" x 4" that is very portable and has good sound lasts 7 hours. You can buy models all the way up to the "Ecoboulder" that are similarly waterproof, but higher power output and bigger. I like the small profile for the catamaran, but use a larger one on the monohull cruiser. You can seriously throw these in the lake and they will continue to play, but they sound better when not partially submerged.
I use a Geckobrands waterproof phone tote. It can be tied to the mast or tramp or worn as a belt or sling, and has room for the phone, wallet, keys, registration papers and more. My iPhone can be operated through the clear front cover. This tote will also hold the EcoXGear Pebble speaker if you want. https://www.amazon.com/gp/product/B01BWVDDIG/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
Couple of JLB flip 4's to connect to my waterproof Samsung phone via Bluetooth. https://www.amazon.com/dp/B01MSYQWNY/ref=twister_B076JVMN1K?_encoding=UTF8&psc=1