Buying stuff in bigger packs

Mum always bought stuff in bigger packs. Family pack? Double-pack? Triple-pack? Seen them all, bought them all. Toothpaste was always bought in a 250g or a 200g tube (the 250g tubes became increasingly hard to find!). Single- or double- packs of Maggi Noodles were seldom bought in our house. Why would we buy them when they had four- and six- packs? This attitude translates into my own grocery and provision shopping with Smitha these days. We go in for the larger packs, the larger bottles, the larger everything. Is there a right size for stuff? Is it better to buy the smaller or the larger packs? I've no clue. But I cringe at even the thought of not being able to buy Shampoo/Conditioner in one of the standard-sized bottles (we get them humongously big, imported bottles from a Spar Hypermarket). This may not be a big deal for some of you - but for me, it's the way I live - it's how things work for me. For putting this integral buying sense into me without even trying, I have my Mum to thank. Thanks, Mum.