The contents is always visible, but the bag is cleverly constructed to allow you to force the selection of small items that you put in the bag.
The bag could contain (for example) a deck of cards, shaken and mixed, and spectator reaches in to select a single card — it is your force card. Use just about any small object that you can put a dozen or two dozen in the bag.
This is a natural and innocent looking prop, a mesh bag with a handle. Good Quality net & plastic handle finish.