I bought this flat colander on inpulse for $5 at Superstore a few weeks ago (Just as they'd hoped of course, I fell right into their web.....) and I love it.
It's handy for washing fruits and veggies, which for some reason seem.... difficult? to sometimes wash in a "regular" colander. I can't explain it. It just works.
It's one of those things that you don't really need, but it's handy to have. Unfortunately it lives out on my counter right now, and the last thing I need is less counter space, but whatevs. Handy.