Sometimes, you buy a special purpose item, and find it works really well for something unexpected. Here’s an example from my kitchen.
I bought a plastic butter storage box. I wanted to take a single stick of butter camping with less chance of squishing or greasing every other item in the cooler.*

Here’s a single stick butter storage container on Amazon ($7) that looks like mine. I don’t have a purchase record to confirm this is the same item, but it should serve a similar function.
This little box is the size of an East Coast† stick of butter. It happens to be a wonderful size for sending three wafer cookies in a lunchbox if you’re willing to break the third in half.
These gluten free Schär wafers have a tendency to disintegrate into crumbs anyway, but breaking one to fit the box probably wastes less cookie. Total devastation is wrought by sending them to school in a baggie like I would with a more robust dessert.

The butter box also works great for a skinny wrap sandwich made with a flexible, flour tortilla instead of bread. Peanut butter or a light layer of thinly sliced deli meat only! You’re working with an interior space designed for a 1.25″ x 4.75″ stick of butter.
East Coast butter cube 1.25″ wide
East Coast butter cube 4.75″ long
Perhaps this dish will suit your own favorite long, skinny, delicate cookie. When it comes to dessert, I like to save every crumb for eating. The lunchbox should get none.
It’s easier for me to test spatial relationships by getting my hands on something. I can draw diagrams and take measurements and make pretty good educated guesses about how things will work in the world‡, but I’m not particularly gifted at mentally fitting shapes together.
I wouldn’t have guessed how often I would use a butter box for school lunches until I had one at home to experiment with. In the quest for packed lunches without waste, this is a useful—and uniquely sized—container.
Read more packed lunch posts: containers I like and a Thermos jar time saver.
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*My cooler tends to be a mess when I go camping, unlike my carefully curated chuck box!
†Growing up in the Pacific Northwest, I had no idea there were alternate shapes for cubes of butter. Imagine my surprise upon moving east for college to discover that something I thought was standardized came in a different shape. The outer packaging also differs. On the West Coast, butter comes in fatter cubes packed into a row in a VHS VCR tape sized box. Back East, the sticks are slimmer and longer and they get packed together into a box more akin to a building brick.
When I pointed this out to my mother, she said, “That must be why some sets of dishes have such weird, elongated butter dishes! I always wondered why manufacturers did that.”
Ah, the things you take for granted before you travel!
‡That’s how I IKEA. I’m very good at IKEA. My success is entirely based upon sketched models, however.