> Of course you can take your water bottles on the plane In terms of energy, that plane flight likely used 1000s to millions of times more energy than that use

> Of course you can take your water bottles on the plane In terms of energy, that plane flight likely used 1000s to millions of times more energy than that used to create a bottle of water. Running the numbers from [1] and [2], I came up with about 200 bottles of water per mile of air travel. Was that trip necessary? What do we think of people who take an "unnecessary" flight (or perhaps a cheaper one because it takes a longer, less desirable route)? Do we consider them to be in "mental decline" or "apathetic" as other commenter have suggested. In comparison to the flight, the bottle of water seems quite insubstantial. So if they found the water bottle more convenient in this scenario, I can't see a major objection. [1] https://phys.org/news/2009-03-energy-bottle.html https://phys.org/news/2009-03-energy-bottle.html [2] https://en.wikipedia.org/wiki/Energy_efficiency_in_transport https://en.wikipedia.org/wiki/Energy_efficiency_in_transport