The popularity of Lululemon belt bag colors can vary based on current fashion trends and seasonal releases. However, some colors consistently remain fan favorites. Black is always a top choice due to its versatility and ability to match almost any outfit. Other popular colors include various shades of grey, navy, and pastel tones like light pink or lavender. Lululemon also releases limited edition colors and patterns that often become highly sought after. If you're after a specific color, it's best to check their website or visit a store, as the most popular shades can sell out quickly!