Should I buy a cooler with a built-in Bluetooth speaker?

Not really — it’s a niche gimmick. Igloo’s Party Bar line and Yeti’s Link mount exist, but a separate Bluetooth speaker sounds better, lasts longer, and isn’t ruined if the cooler gets knocked over or rained on. USB charging ports on coolers are actually useful for camping, but skip the speaker combo unless you’re tailgating and want one less thing to carry.