What is a subscription box?

A subscription box is a product grouping where multiple products are shipped to customers on a recurring basis. The customer is charged for their subscription on a schedule, most commonly monthly.

Different box types have different features, most commonly, the boxes are surprise items within predetermined guidelines.  

Boxes that I sell that are grouped items are just one time commitments, stay subscribed for one box, or forever.

The subscription model that offers a discount for monthly subscription is a three month commitment.  And if you need to skip a month here and there, that's no problem.