Know more about it here. Also to know is, what is self tag?
Self-Tagging allows you to speed up the checkin process by letting you print your own baggage claim tag and place it on the bags that you wish to check. Once you have tagged all of your bag(s), proceed to the designated Bag Drop area.
One may also ask, what does pink tag mean? Large rollaboards will get a pink tag usually and you'll get your bag back on the jetbridge (instead of baggage claim). If you're zone 2 or 3 and the plane is full you'll probably have to pink tag it even if it's a bit smaller. If you can fit it under the seat in front you can definitely take it in board..
In this regard, how do I get an electronic bag tag in Alaska?
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What is an electronic bag tag?
BAGTAG is the electronic bag tag that allows you to check in your suitcase, whenever and wherever you are and want to go.