Hi, I just saw your question since I just joined the group, so sorry for the late reply. I happen to be a Tupperware consultant, and it's true: the FridgeSmart Containers really do work to extend the life of strawberries as well as all your fruits and vegetables! The FridgeSmart is designed with ridges on the bottom. That serves to keep the moisture from touching the fruit (which advances the molding process). All fruits and vegetables require different amounts of air to "breathe" and keep it fresh, so that is what the pair of vents are for, to allow the proper amount of ventilation. In the case of strawberries, they are low oxygen consumers, so the vents need to be closed. Using these containers it can keep strawberries fresh for possibly two weeks (as opposed to two days!). Instead of having to do all that work for the strawberries, just put them directly into the containers. Then wash them just before you want to use them. It's so much easier! I speak from personal experience on this one!
As far as the cost of Tupperware, I know it's not cheap, but definitely worth the investment when you think of all the money you would save by not throwing away all the strawberries and other food that goes bad quickly. So you have to think of it as an INVESTMENT, because in the longer term you will save money on food -- and you should know that Tupperware also has a lifetime guarantee on their products!
Of course, you should try to buy the FridgeSmarts when they go on sale if you're looking to get them cheaper. They are not currently on sale, but I can certainly let you know when they do go on sale if you like. You can feel free to check them out on my website: www.my.tupperware.com/camillajoe
Hope that's helpful!