By family pack I mean if you buy more for less price per kilogram (or ounces IDK what you use).

Usually when I buy chicken for example even if it’s just me, I buy 2kg (4.40 Ounces), I cut out what I need for the day and the rest get frozen. Same for some vegetables. Then for shelf stable stuff I always overbuy as well. For example I use a lot of oregano and I bought the dried plant 2 years ago and I’m almost finished with it (it costed 5€, the usual 10g spice cost like 1.50€ and it last me a couple of months)