Almost any container with a sealable lid will do. Anything from an old coffee can with a lid to Tupperware will work. The fancy stainless steel coffee containers with clamping seals are nice and attractive but not necessary, unless you plan to store your coffee in the freezer. If you only keep a two-week supply of coffee on hand, freezing coffee is not necessary. However, if you find yourself with a few extra pounds that you find yourself forced to store, then a good airtight container is absolutely necessary.
Freezers have the tendency to dry out foods.
If your coffee container is not sealed the beans will become dehydrated and tasteless. If your coffee container is properly sealed then freezing will add about an extra week to its life. But that's about all you will get out of freezing. Remember, stick to a two-week limit and you will enjoy your coffee a lot more.