The Bose SoundLink Flex 2nd Gen is decent for the outdoors. It's remarkably portable and has excellent build quality, so it's a good choice for park hangs or hikes, especially since its IP67 rating means it'll survive being accidentally dropped in a shallow puddle. You can place it either standing up or lying down, and it will adjust its sound accordingly. If you're on a stroll, you can even attach the side strap to your backpack. Its battery life of roughly six to seven hours will get you through all but the longest hangs and hikes.