One example of product which has perfectly elestic demand is coal.
People take fewer vacations as air fare gets higher.
Cotton textiles and kraft dinner.
There is a latent demand for a low-calorie, creamy, and excellent-tasting ice cream.
soda, jeans, bicycle, new cars, pink (or other color) glass, Gone With The Wind book, AND MANY OTHER THINGS (the items that have elastic demands are those that can be delayed and have substitutions)