Net contents, bottle size and parcel weight are different numbers
Compare product quantities without confusing them with container dimensions or the weight used for shipping.
Identify the number being shown
A listing can show the amount of product, the dimensions of its container and a shipping weight. Label each number before comparing two items. A large-looking bottle in a photograph is not a measurement of its contents, and a milliliter amount is not the same unit as grams.
The FDA's United States cosmetics labeling guide distinguishes a declaration of net contents from the surrounding package. For shopping comparisons, preserve the stated unit and quantity rather than estimating it from the size of the outer box.
Compare like with like
For two versions of the same product, write the stated quantity beside each price. Keep grams with grams, milliliters with milliliters and piece counts with piece counts. Do not convert between volume and weight without product-specific information that supports the conversion.
For a set, list every included item separately. A main bottle, a miniature and a tool do not combine into one meaningful volume figure. Sheet masks also need both a piece count and the quantity shown for each piece, where provided.
Treat delivery as a separate calculation
A parcel includes containers, protective material and the shipping box as well as the products. The final packed weight may therefore differ from the sum of the quantities printed on the labels. Use the shipping estimate or confirmed order details for delivery planning.
When considering a small order at THE CAST, consult the current shipping guide and checkout information. Avoid adding an extra product solely because its label looks small; the whole parcel and destination determine the relevant shipping calculation.