Liff: a user's manual

What's the word for the amount of breakfast cereal in a packet which leaves you with a choice between a tiny bowl of cereal today (and the certainty of the same tomorrow), an absurdly large bowl of cereal (and the need to go to the shops and buy more cereal today), or a sensibly-sized bowl of cereal (and the need to buy another packet of the same type of cereal today so that the whole process can be repeated another few dozen bowls down the line)?

Last night I put all my odd socks in a bag. They're not really odd socks, though, they're just pairs that haven't met yet.