Save your $$$ the anodised finish on the MacBook is extremely durable, wrapping it in plastic is akin to showering with your waterproofs on 🙂
FWIW I use my Mac Notebooks for work, frequently traveling internationally as a function of my profession. None of my Mac`s current or retired has ever had issue with scratches etc. I use a sleeve and a decent quality travel bag. Personally wrapping you Mac in plastic very much detracts from the experience of owning a Mac Notebook and serves little to no purpose, enjoy your Mac as it was intended 🙂
Q-6