Just putting them in your bag or in your wallet is not the best idea and can get you a ticket:http://www.txdps.state.tx.us/vi/publications/rules/safety_manual/Chapter%203.htm#20.04 20.04 Certificate Mounting Procedures for Motorcycles, Motor-Driven Cycles, and Mopeds1. On the Vehicle (Optional). Punch the month of issuance and year of expiration. Remove the certificate’s back paper and attach the certificate face up on the vehicle’s rear fender or any other visible location on the rear near its license plate. Place the certificate in place and apply firmly. OR2. Backing Plate (Optional - to be furnished by cycle owner). Punch the month of issuance and year of expiration. Remove the certificate’s back paper and attach the certificate face up on the backing plate which is mounted on the cycle near the license plate for this purpose. Place the certificate in place and apply firmly. 3. Other Provisions - Motorcycles, Motor-Driven Cycles, and Mopeds. Reject the vehicle if no fender or optional location is available for applying the inspection certificate.