The Denver Post reports that in a federal lawsuit filed Monday, Osprey claims that a California apparel company is misusing the Colorado-based outdoor gear maker’s branding in violation of an earlier trademark agreement between the two companies. Osprey alleges that Aether, which has stores in Aspen, New York City, San Francisco and Los Angeles, is selling backpacks branded “Aether,” even though the two companies agreed in 2019 that it would not do so. Osprey has used Aether to brand its backpacks for more than two decades, the complaint states. The name is not a registered trademark, but is in the process of being approved as one. The Denver Post says that the backpacks sold by Aether do not appear to be designed as hiking backpacks, but rather as smaller book bags or commuter bags.