mbouti Could I exchange the position of "used" like the sentense below No; it is a different meaning; your first sentence presumably refers to new packaging, but your second sentences seems to refer to recyled packaging. In the first instance, I see no need for the modifier at all, and 'going down' is unclear and seems wrong to me. The amount of packaging is decreasing.
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mboutiCould I exchange the position of "used" like the sentense belowNo; it is a different meaning; your first sentence presumably refers to new packaging, but your second sentences seems to refer to recyled packaging.