Yes and no, depends on what you dehydrate. Some lasts longer than others. Freezedried will usually out last dehydrated. Also how you pack it. Here are a few links that may help... Doing Your Own Food Storage. Dehydrated Fruits and Vegetables : Everyday Food Storage Recipes-Food Storage & Recipe Blog How to Dehydrate Foods About Dehydrated Foods Here is a 3 part video on the subject... [ame="http://www.youtube.com/watch?v=QxVpIHre2ao"]YouTube- How to dehydrate and store food PART 1[/ame]
Mylar is probably the best currently available material to use. Being aluminum based, it is a much denser material than plastic and has much lower gas and water permeability rating. Plus the reflective surface will reduce the amount of light damage the package could potentially come into contact with. So, yes, it could keep your food longer.