On 21 Jan, 18:03, -MIKE- wrote:

Never use the things (a sled, use a box) - too dangerous.

Semantics. *

That's how we communicate subtle differences. Like the difference
between a whole finger, and a hole in your finger.

You built a sled with a lid.

Strictly, "a sled with walls", but yes. However those walls are
important, but not always used. They're worth incorporating.