iddt3
Donor
Only if you throw the bottles away afterwards, but how many times could that bottle be sterilised and reused before they'd have to melt it down (at which point it would probably end up as another milk bottle), 15, 20 times? Compare that to a plastic bottle, which probably has to be pulped after each use, and then rerolled.
The unfortunate thing about food plastic is that because plastic is porous it comes out a lower grade then it come in, so the plastic milk cartons you used can't be recycled into more milk cartons.