Plenty of people prefer sparkling water to still, but it's not an on-the-go treat short of dragging cans or a countertop device around with you. Aerflo changes that. This portable carbonation device uses small CO2 capsules to deliver personalized sparkling—from mild to wild. Designed for the pursuit, the lightweight Aerflo bottle is made from Tritan and stainless steel suitable for urban or rugged adventure. When your supply of capsules (each makes 2L) is done, simply drop them in the mail for an automatic refill. Each Aerflo System ships with 4 capsules, enough to make 8L+ of sparkling water, as well as a portable capsule case.