Designed for the ThermoFlask® Travel Mug. One O-Ring and one Sip Plug are included in the pack. The O-Ring fits on the bottom of the lid while the Sip Plug fits inside the fliplock lid. Both items are BPA free. 

• Fits the ThermoFlask Travel Mug
• Top rack dishwasher safe 
• BPA Free 

Note: This item ships via USPS First Class Mail.