Do I need a liner for the Thylacine 20ºF sleeping bag? Jake July 31, 2019 16:35 Updated Follow If you are camping in conditions colder than 20ºF, you will need to purchase the Thylacine Liner to zip into your Thylacine sleeping bag. For temperatures of 20ºF and above, you do not need a liner. Related articles Are your products Bluesign approved? How does the Thylacine 40ºF adjust to colder conditions? What hammocks are compatible with the Pongo pad? Comments 0 comments Please sign in to leave a comment.