A few decades ago Tupperware had a "lettuce keeper" that had a small spike in the middle of a tub. You were instructed to "whack the lettuce," remove the core, and then you stuck the head in the tub with the spike where the core had been. The recommendation was that you add a small amount of water in the bottom of the tub to make sure the lettuce didn't dry out. I suspect they still make it.

A first objection to it, although it did seem to slightly lengthen the time you could store a head, is that every head of lettuce you have then takes a little more 'fridge space than the largest head of lettuce that Tupperware imagined you might ever hope to have^*.

A second objection to it was that ... ... ... it was Tupperware.<sup>**

*</sup> It seems to be a general rule one can rely on that anything that claims to make it "easier" to store some particular kind of thing always takes at least 1.7 times as much storage space as thing being stored - and often much more. Anything that claims to make it easier to store some particular kind of thing and is CUTE requires at least 3.9 times as much storage space as the thing being stored - and often MUCH MORE.

^** I do use, by choice, a set of tupperware cannisters. They are quite good. No other Tupperware is allowed in my home, as there are better alternatives for all other purposes. I am slightly disappointed in the cannisters, as durability seems a bit questionable. Two of the cannisters in my set have started developing slight cracks in the lids. I've only had the *&@!% things since 1982! They likely will be replaced by a set of old metal coffee cans (hand painted of course) - the "next best" cannister, although the plastic lids need frequent replacement - when I get around to it.

John