Mammoth Hockey bagmaker asks 10th Circuit to block Utah team from selling bags under same name

Attorneys for Utah Mammoth defended the team's name before the 10th Circuit, arguing multiple third parties already use 'mammoth' commercially, from sports teams to bagmakers. The team adopted the name in May 2025 after its first choice, Yeti, risked a trademark fight with the cooler company.

Mammoth Hockey, a Portland bagmaker selling bags priced above $300, sent a cease-and-desist letter after Utah Mammoth began selling bags priced $83 to $199 along with jerseys, hats, and other merchandise. A district judge denied Mammoth Hockey's injunction request in December, prompting the appeal.

Mammoth Hockey's attorney argued the case involves 'reverse confusion,' where a bigger, richer entrant drowns out a smaller established user, and said the district court never examined whether Utah Mammoth acted in bad faith. The panel did not indicate when it would rule.

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