jellomellowUE boom 2 is super sick. I've had mine for a year now and don't have a single complaint.
I have the UE Boom 2 as well. Battery lasts forever, very loud, decent sound, 100% waterproof (they actually tell you to clean it with warm soapy water lol), it's durable (I've dropped mine down a whole flight of steps before, it has a steel hook on the bottom to use if you want, and it's shaped like a 16oz can so very portable and easy to store in a backpack.
The UE speakers can also link up for party mode so if your buddies have them, you could literally have the entire section of the chairlift blasting the same song.
Amazon usually has sales so it's easy to find overstock ones on huge discounts.
My only complaint is the bluetooth range isn't as far as they advertise but still adequate.