Something that offers good value for its price; economical or cost‑effective (often used on product labels).
この洗剤は徳用サイズで、通常よりもずっと安い。
This detergent comes in an economy size and is much cheaper than usual.
お徳用だから一つ買っておくと長持ちするよ。
Since it's an economy pack, buying one will last you a long time.
スーパーの特売コーナーに徳用商品が並んでいた。
Economy items were lined up in the supermarket's sale section.
An economy or family size (package) that contains more quantity and is cheaper per unit (label often reads お徳用).
お徳用のポテトチップスを買って、友だちと分けた。
I bought a family-size bag of potato chips and shared it with my friends.
お徳用パックは一人暮らしだと少し多すぎるかもしれない。
An economy pack might be a bit too much for someone living alone.
この商品は徳用版が出てから売れ行きが伸びた。
Sales increased after the economy-size version of this product was released.