The UT 50K by UT Bar (associated with Flum/Flumgio Technology) is the highest-puff disposable vape on the US market in 2026 — rated for 50,000 puffs in Eco mode. It features a unique dual-tank system that lets you switch between two flavors mid-device, a color digital display showing battery and e-liquid levels, adjustable airflow, and a squeezable back panel. At ~$20, the cost-per-puff ($0.0004) is the lowest we've measured. But 50,000 puffs raises real questions: Does the flavor hold up over months of use? Is the device too bulky? And in a market where the FDA has only authorized 48 products — none of which are disposables like this — should you be buying it at all?