Use all year around. Bubble Tree Original Refillable system is not just safe for the environment but safe for you too. Get rid of one time use plastic bottles. Reuse! Refill! Recycle and Share! This item features 1 Liter of eco-friendly superior bubble solution and 2 aluminum bottles that can be refilled. Grab N’ Go and take this to your next celebration, event or just have fun with your family and friends!