This was suggested as a smell proof Dynavap case Bought it off amazon for 6.99. Used the case and cut the telescoping straw to make a bong w mason jar. The black silicone piece came with the straw and I just folded it back and it fits my M perfect. https://i.imgur.com/KpL1IKV.jpg https://imgur.com/a/Ho8htiW/
Amazon link https://www.amazon.com/dp/B07S176CXS/ref=cm_sw_r_cp_api_i_K69FEb23RY2DQ
Found the idea here https://reddit.com/r/Dynavap/comments/fad0zk/found_another_pocket_friendly_case_for_the_omnixl/