The only real viable alternative is a metal can with a metal screw on lid and a rubber seal.

Even then, unless it is recycled aluminum, I'm not sure how much you're gaining, environmentally. Heavier to move, harder to form, probably covered in some sort of coating on the inside anyway. Plastic isn't great- pretty much everything except weight, water impermiability and ease of forming are downsides, but metal isn't free either.