From still to sparkling with the tap of a button, Aerflo gives you refreshing and customizable carbonation wherever you go. The lightweight and leakproof bottle that carries your precious seltzer is made from stainless steel and BPA-free Eastman Tritan that still fits in your cup holder. Tap the button to carbonate - always tailored to your taste. Each capsule makes 4+ bottles of crisp sparkling water. Once your capsules are out of bubbles, pack & send them back to Aerflo in the pre-paid Capsule Exchange Box. Your fresh ones will be on their way automatically, always 50%+ savings vs. single use cans or bottles..View Aer1 Sparkling Water System by Aerflo on our site for more info. - The Bespoke Post store has the greatest gear from the world's best small brands. Free exchanges, easy returns and no commitments.