There is an all new Topsy Turvy Soda Bottles on the market..
It's done with REAL half liter Coke PLASTIC Coke bottles...
Most of the major magic suppliers have it.. but you can also order direct from the manufacturer.
it's had universally good reviews from the cafe.. and most everyone who's ever bought one!
For those that have done the routine with the glass bottles.. it takes some getting used to the new props.. but you can give the bottles away at the end... and you can't break them in transit.. or if they fall off your table.