Craig Clark Show, 49, of Portland said the bag provided protection, had been blessed by a medicine woman and had remained closed since 1995, the Sandpoint (Idaho) Bonner County Daily Bee reported Friday.
The suit seeks $25,000 in damages.
Show was stopped on U.S. Highway 95 in Granite Hill while riding his Harley-Davidson motorcycle and was arrested on suspicion of driving under the influence after a test revealed a blood alcohol level of 0.16, police said.
In his Jan. 17 complaint against the state police and the Bonner County Sheriff's Office, Show also alleged he was persecuted for his religious beliefs and that his motorcycle was scratched by a drug-detection dog during a search.
The lawyer representing Show in the DUI case moved to suppress evidence on constitutional grounds, but a judge ruled the traffic stop and DUI investigation were conducted lawfully.
Show was supposed to have been tried this month, but was ill. A new trial date is to be set.