Are refills really cheaper? Compare the price per 100 mL and the amount you can use

The smaller pouch costs less—but how much is inside?

Imagine reaching the shampoo shelf and finding a bottle, a refill pouch and a larger refill pouch. The pouch has a lower price, but also contains less. On a shelf like this, check the quantity alongside the price.

The price of one package alone can hide what you are comparing. A price for the same quantity gives you another view. Osaka City’s Consumer Affairs Center explains unit pricing: displaying a price per fixed quantity, such as 100 grams or 100 millilitres, alongside the selling price.

Start with two details: the price and the contents. Different shampoos do not necessarily have the same formulation or directions. Comparing the same contents used in the same way, with different packaging or quantities, makes the calculation easier to interpret.

Put a JPY 600 bottle and a JPY 420 pouch on the same 100 mL basis

All prices here are invented. Assume the same contents and directions: a 400 mL bottle for JPY 600, a 300 mL refill for JPY 420, and a 900 mL refill for JPY 1,170, including tax. There is no shipping charge or membership fee, and you already have a suitable container. These are not actual market prices.

Use price divided by volume, multiplied by 100. The bottle costs 600 ÷ 400 × 100 = JPY 150 per 100 mL. The regular pouch costs JPY 140 and the larger pouch JPY 130. Under these assumptions, the larger pouch has the lowest unit price.

Yet the payment at the till is JPY 1,170 for the large pouch and JPY 420 for the regular one. Saving JPY 10 per 100 mL means paying JPY 750 more today. Your current budget and existing stock still matter; the lower unit price need not decide the purchase.

Without a suitable container, the pouch may not be ready to use. Include any necessary bottle or container in your total. Before looking for points or conditional discounts, compare what you would actually pay.

Six months’ worth is a quantity, not a storage promise

Before choosing a large pouch, consider how quickly you use the current product. At an assumed 150 mL a month, 900 mL represents six months’ quantity. That division is not a statement that the product may safely be stored for six months after opening.

Lion’s official Q&A advises using its body soaps, shampoos and related products promptly after opening. Do not turn that guidance into a universal expiry rule for every manufacturer. Check the label and official guidance for the product you have.

Plans can change: you may want a different scent, or someone in the household may start using another product. Think about present usage and remaining stock rather than starting with a large quantity of something untried.

Check the shelf and the right container before buying

Checking the empty space first is easier than finding storage afterwards. Can the opened pouch be kept as directed, stand securely and be handled easily? A larger package also changes the weight you lift and the space it needs. Choose a quantity your existing shelf can accommodate.

A similar-looking container is not automatically suitable. For products such as hadakara body soap, Lion instructs users to refill the same product’s container. It explains that other containers can cause dispensing problems or allow mixed contents to solidify. This is guidance for the relevant Lion products; check each other product’s own instructions.

Do not swap liquid and foaming products, or different types within a brand, simply because one costs less. Follow the product’s directions for refilling and cleaning the container. Mixing contents or diluting with water is not part of this cost comparison.

Try it with just one familiar purchase

There is no need to research the unit price of every household supply. Start with the next item you need: note the tax-inclusive price, quantity, whether the contents are comparable, and whether you can finish it. A displayed price per 100 mL can help with the calculation.

Concentrated products or different doses cannot be fully compared by volume alone. Check the stated amount per use and its conditions when directions differ. Grams and millilitres are different measures too; do not simply treat equal numbers as equal quantities.

A large pouch may fit when its unit price is lower, you can use it appropriately and there is room for it. A regular quantity can make sense when you want a smaller payment or still have stock. Instead of deciding from “refill” or “large pack” alone, match the price to what you can actually use.