The short answer is no, you are generally not allowed to keep United Airlines blankets, especially the premium Saks Fifth Avenue bedding found in Polaris Business Class. These high-quality duvets and "cool-touch" pillows are considered "soft product assets" and are laundered and reused for subsequent flights. If you take one, you are technically committing a minor theft, and flight attendants are trained to collect them before landing. In Economy (United Economy/Premium Plus), the blankets are much thinner and less luxurious, but the policy remains the same: they should stay on the aircraft. In 2026, United has increased its focus on sustainability, using recycled materials for its bedding, and they encourage passengers to leave items behind to minimize waste. If you truly love the Saks Fifth Avenue branding, United often sells similar (brand-new) versions through their online "United Shop" or through limited-edition promotional giveaways.