Use Me Box by Mr. Magic
Here's a great solution for placing items that you've either just produced, or "ditching" secret items once you've used them. It's a foldable box that opens up when you need it!
You can even hide objects behind the box - when you use the box to pick up something, secretly take the item you need and your audience will never know until you are ready to produce it!
Set it up prior to your show. It folds flat for portability. When your performance is over, simply fold it flat once again.
A great tool for the working magician!