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

On SoftBank it is the design shipped in 2014, shown above at full size. Older revisions are listed beneath it.

When did SoftBank add バックパック?

SoftBank first drew バックパック in 2000, released 2000年1月1日.

SoftBank Corp. has shipped 7 versions of バックパック. Each is dated, so you can see when the design changed.

SoftBank

SoftBank Corp. has drawn バックパック 7 times. Every revision SoftBank has shipped is below, newest first.

What does バックパック look like on SoftBank?: On SoftBank it is the design shipped in 2014, shown above at full size. Older revisions are listed beneath it.
When did SoftBank add バックパック?: SoftBank first drew バックパック in 2000, released 2000年1月1日.
How many times has SoftBank redrawn バックパック?: SoftBank Corp. has shipped 7 versions of バックパック. Each is dated, so you can see when the design changed.

SoftBank artwork for this emoji spans 2000 to 2014.