Yes, you are absolutely allowed to bring your own blanket on an international flight, and it is highly recommended in 2026 as many airlines have either stopped providing them or charged for them. According to TSA guidelines, a blanket is a permitted item and is usually classified as a "personal accessory" (like a jacket or hat) rather than a piece of carry-on luggage. This means you can often carry it under your arm or draped over your shoulder without it counting against your bag limit. Bringing your own blanket is a "health hack" as well; while airlines are supposed to wash their supplied blankets between uses, many peer-to-peer reports from flight crews suggest that on "middle legs" of a journey, blankets are simply refolded and placed in new plastic bags without being laundered.