SJ: Learn Mishnayos Taharos (to start) and then ask questions.
Imanonov: Before telling others to expand their knowledge of Halachah, you might want to expand your own. Tzamid Pasil is only Shayach by a Kli Cheres.
I agree with Rebdoniel, though. I don’t see how this plastic bag helps. It’s also an Ohel Zaruk. And if you claim that it’s not Zaruk/Zaruk is Muttar in such a case, the plane itself should count. (Okay, so there’s one Tzad gained by using the plastic, but I highly doubt that gaining this Tzad according to some Shittos is worth the fact that it makes Halachah look like Kucha V’hitula.)
Edit: I just looked at the picture. There’s no Poseach Tefach in that bag. It cannot be to avoid any Tumah because being in that bag does absolutely nothing. There’s nothing Halachic about what he did. Either it was a mistake on this guy’s part in thinking that it helped or he’s just a nut.