Fitting a full beauty routine into a TSA-approved quart-size bag requires a strategic shift from liquids to solids and a focus on multi-use products. The most effective tip is to audit your routine for "hidden" liquids: swap liquid foundations for powder compacts, cream blushes for sticks, and bottled shampoo for solid bars. For the liquids you can't replace, use high-quality travel containers like Cadence capsules or Matador flat packs, which are more space-efficient than traditional round bottles. Prioritize multi-taskers, such as a tinted moisturizer with SPF or a lip-and-cheek tint, to reduce the number of individual items. For skincare, consider using dry face cloths that activate with water or "serum sticks" that are solid at room temperature. Always pack your largest liquid items first—usually your cleanser and sunscreen—and nestle smaller items like eye drops or travel-sized serums into the gaps. If you are still struggling for space, remember that you can buy basic items like toothpaste or body wash at your destination, or use the high-quality amenities provided by many modern hotels.