Common essential beauty products for a makeup bag include foundation or tinted moisturizer, concealer, mascara, eyeliner, lipstick or lip gloss, blush, and makeup brushes or sponges for application. Additionally, having a quality makeup remover, sunscreen, and a versatile eyeshadow palette can be beneficial. Tailor your makeup bag to your personal preferences and daily needs, ensuring you have products suitable for both natural looks and more glamorous occasions.