A joke with a limited target group...

The Birkin bag is a luxury handbag by Hermès that goes for thousands of dollars, while the Birka bag is the Birka version of the common viking age handbag, that you can make yourself.
Every self-respecting person knows which one to choose!

There have been viking age bags found in several locations, Birka only being one of them. You can learn more about early mediaeval scandinavian handbags here, if you're interested: https://sagy.vikingove.cz/en/reconstruction-of-the-viking-bag/ (I'm not affiliated with this research.)