Like most MLS venues, Lumen Field enforces a clear bag policy. Fans can bring clear plastic bags (12x6x12 inches or smaller) and small clutch purses (4.5x6.5 inches). Regular backpacks and large purses are not allowed.
The policy expedites security screening and improves safety. Check Seattle Sounders's official website before attending, as policies can change. Medical exceptions are typically accommodated with advance notice.