Sorry, I'd hate to be seated in front of this.My most recent travel item is this https://www.amazon.co.uk/dp/B07FBCZFNB/?coliid=I3A56TY4EJGHO3&colid=2REXPJGDZUSX2&psc=1&ref_=lv_ov_lig_dp_it
Quner Foot Rest - Portable Travel Footrest for Airplane Ergonomic Adjustable Height Foot Hammock Cushion to Relieve Knee Pain Flight Under Desk for Car Home Office Foldable Footstool (Pink)
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I used it this summer on a 10 hour transatlantic flight and it was great.
I also use compression socks for flights, you can buy them in a drugstore or pharmacy.
Packing cubes get another vote.