Yes, you can bring a Bluetooth speaker on a plane as long as it does not exceed the specified size and weight limits for carry-on luggage. Most airlines allow passengers to bring one personal item (e.g., a purse or laptop) and one carry-on bag onboard, so your speaker should fit within these dimensions. However, it's always best to check with your airline before packing to avoid any surprises at the airport. When bringing a portable speaker on an airplane, be sure to keep it in your carry-on bag and not in checked luggage to prevent damage during transit.