What does バックパック look like on Facebook?

On Facebook it is the design shipped in 16.0, shown above at full size. Older revisions are listed beneath it.

When did Facebook add バックパック?

Facebook first drew バックパック in 1.0, released 2014年1月31日.

Meta Platforms, Inc. has shipped 13 versions of バックパック. Each is dated, so you can see when the design changed.

Facebook 2.2

This is the design Facebook introduced in 2.0, shipped again unchanged. It was not redrawn for this release.

✳ marks a release that redrew this emoji. The rest re-shipped the design unchanged.

What does バックパック look like on Facebook?: On Facebook it is the design shipped in 16.0, shown above at full size. Older revisions are listed beneath it.
When did Facebook add バックパック?: Facebook first drew バックパック in 1.0, released 2014年1月31日.
How many times has Facebook redrawn バックパック?: Meta Platforms, Inc. has shipped 13 versions of バックパック. Each is dated, so you can see when the design changed.