Ok, so with my libro-douche mom throwing away all my old Nalgene's and REI getting rid of them too, due to the whole BPA scare, I seem to be left with the option of a.) buying the old style Nalgene off of Ebay, or b.) just buying the new Nalgene with the Tritan copolyester. But does anyone know if this stuff is as durable and tough as the old bottles with BPA were?