But the tube is open, no?

One of the things I like about going to my local agricultural supply store is that they don't seem to have the need for retail packaging. There are large boxes and creates (clearly labeled most the time) that contain each item. No need to individual package each part. Even the big-box hardware stores do this for things like screws. There are many items that can do with much less packaging.

Indeed, so it's a screw handle that comes affixed to the screw. OP presents it as dual-use: handle and packaging. But it appears to only have the former use since the latter use is unnecessary.