This is the 5414th most frequent Russian word.
пачек
"Пачек" in English translates to "packs" (plural of "пачка," meaning a bundle or package).
Here, 'пачку' refers to a contained unit of a product, such as a pre-packaged detergent in a bag or box.
Мне нужно взять пачку стирального порошка.
I need to get a pack of laundry detergent.
Here, 'пачки' refers to specific packages or boxes containing leaves of tea.
Я купил две пачки чая.
I bought two packs of tea.
In this usage, 'пачке' describes a bundle or collection, potentially tied together, of papers or documents.