Stanley is a brand that makes things like thermal mugs. They were quality and lasted for years, but weren’t designed with looks in mind. They were favored by tradespeople because they’re hard on stuff and it just works. (I knew them for thermal mugs that held coffee.)

For reasons unknown to me, influencers got a hold of Stanley mugs, with a straw and handle. They became very popular. The company now makes them in many different colors and some people decide to collect them.