2ml Tank Capacity – What is it in Vaping?

Definition

2ml Tank Capacity refers to the maximum volume of e-liquid that a vape tank can legally hold under the Tobacco Products Directive (TPD) regulations enforced in the European Union, United Kingdom, and adopted by Australia. This 2 millilitre limit applies to refillable vape tanks and pod systems, ensuring controlled nicotine consumption and reduced risk of leakage or spillage. For Australian vapers, a 2ml tank strikes a balance between portability and convenience, offering approximately 600–800 puffs per refill depending on CoilResistance“>coil resistance and vaping style. While smaller than pre-TPD tanks, the 2ml capacity remains standard across most Thread“>510 thread devices and is compatible with widely available Battery“>18650 battery, 21700 battery, or 26650 battery mods.

Technical Details

Internally, a 2ml vape tank is engineered with precise chimney and chamber dimensions to comply with the 2 ml maximum fill line without compromising flavour or vapour production. Most tanks achieve this by shortening the glass or plastic reservoir and incorporating a fixed chimney that displaces internal volume. Common materials include borosilicate glass or PCTG plastic, both resistant to acidic e-liquids including high-VG or 0mg nicotine juices. Threading is universally 510 thread, ensuring cross-brand compatibility. Variations include top-fill (slide or twist cap) and bottom-fill designs, with some models offering bubble glass extensions sold separately for markets outside TPD zones. Coil resistances typically range 0.15–1.2 Ω, optimised for 2 ml capacity to minimise dry hits and maximise coil longevity.

Usage & Tips

• Priming: Always drip 3-4 drops of e-liquid directly onto the coil before first fill to prevent burning.
• Refill frequency: Expect 1-2 refills per day for moderate DL vapers; MTL users may stretch to 2 days.
• Leak fix: If tank leaks, check o-rings are seated correctly and avoid over-tightening the 510 thread.
• Travel: When flying, empty the 2 ml tank below the fill line to avoid pressure-induced leaks.
• Safety: Use only Australian TGA-compliant nicotine e-liquids; never exceed 100 mg/ml nicotine concentration in your 2 ml tank.

History & Context

Prior to 2017, tanks commonly held 3–6 ml. The EU TPD—mirrored by Australia’s Therapeutic Goods Administration (TGA)—capped capacity at 2 ml to discourage excessive nicotine intake. Manufacturers responded by redesigning reservoirs, sparking innovation in compact coil technology and top-fill mechanisms that maintain performance within the 2 ml limit.