We consider a "bundle" any listing with multiple products under one ASIN .You can read our guidelines for creating bundles here.
Whatever the bundle or set’s contents may be, they must be packaged in the same box. Additionally, shipments containing bundles or sets must be clearly identified as such with an easily legible label reading, "This is a set, please do not separate."
Watch this short video to see examples of how your products should be prepared for shipment to and storage in Amazon’s fulfillment centers.