Title: Not as advertised
Review: Bought these and there is no inner- valve to prevent leaks. I've not had to use it, so don't know how sturdy it will be. You would have to throw it away immediately after using it or hold it upright in your lap, because it will definitely leak! It is also clear rather than opaque and there was no packing slip, either. I'm a little scared to try this product after reading the other review. Giving it two stars, because I haven't had to actually use it, yet.
Is this product review negative?