I also prefer the harder bottles @Resistance . Many people think that the bottle in the Luxotic is the same as the ones for the old Dripbox. The Luxotic bottle is 40mm X 18mm and the dripbox is 49mm X 18mm and is supplied with a useful cap. The ridges on the bottles are also in different places.
LUXOTIC BOTTLE
DRIPBOX BOTTLE
LUXOTIC BOTTLE
DRIPBOX BOTTLE