Key Points:

Resistance and Vaping Style: The 0.4 Ω resistance is the lowest available for the G3 series, making it ideal for a warmer, looser draw, best suited for RDTL (Restricted Direct-to-Lung) and a loose DTL experience.

Capacity Variation: While you specified 3 mL, the most common capacity is 2.5 mL (international/FDA markets) or 2 mL (TPD/EU markets). The 3 mL capacity is associated with the larger pod designed for the Caliburn G3 Pro (sometimes called GPP XL pods).

Filling Method Variation: Uwell offers both side-fill and top-fill versions of the G3 pods. You specifically asked for the Top-Fill version, which is available. Note that some kits, like the G3 Pro, may package the 0.4 Ω pod as a side-fill.