Skincare and wash products on a plane
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Start with the product in your hand, rather than its name. Shampoo, shower gel, face cream and toothpaste all count toward the liquids allowance at a US security checkpoint. The marked capacity of the bottle or tube matters even when it is nearly empty. A face scrub may be dry grains or a cream with grains; a sheet mask may have free serum inside its pouch.
Liquids at a US checkpoint
Under the TSA 3-1-1 rule, ordinary liquids, gels, aerosols, creams and pastes in carry-on bags need containers of 3.4 oz (100 ml) or less, all fitting in one clear, quart-sized zip-top bag per passenger. This includes bath oil, liquid soap, hand sanitiser and shaving cream. Put a larger ordinary bottle in checked baggage only after checking that the product itself is permitted there. See the liquids and containers guide for the wider packing rule.
These are US checkpoint rules, not a rule for every airport where an English-speaking traveller might depart. Check the departure and connection airports before relying on a larger container.
Solids, powders and pressurised cans
Bar soap, a manual toothbrush and dry bath salts do not use space in the liquids bag. Loose face powder is also different from a cream or mousse; keep loose powder closed so it cannot spill during screening. For a sheet mask, check whether its pouch contains free liquid rather than assuming every mask is dry.
Sunscreen may be a lotion, solid stick or aerosol, and each form needs its own check. Close bottles and tubes securely. For toiletries in aerosol cans, protect the nozzle against accidental release. The FAA PackSafe guidance also sets limits for medicinal and toiletry articles in baggage; TSA checkpoint limits still apply to carry-on liquids. Check your airline's baggage conditions separately.