Containment mat that converts to luggage with secure seal

A convertible containment device, comprising:

• a base means for providing a surface for items, the base means having a perimeter and being configured to substantially lay flat on a supporting surface when in an open configuration;
• a lip means for containing the items from leaving the surface of the base means when the base means is in the open configuration, the lip means extending substantially perpendicularly relative to the base means in the open configuration;
• and
• a closing means for causing the lip means to gather together and form an annulus that is nearly completely closed, whereby the convertible containment device converts to a bag-like configuration from the open configuration.

A convertible containment device, comprising:

• a base means for holding items, the base means configured to substantially lay flat on a supporting surface when the device is in an open configuration, wherein the base means has a perimeter;
• a wall means for containing the items on the base means when the device is in the open configuration, the wall means being affixed to the perimeter of the base means and configured to substantially extend perpendicularly from the base means when the device is in the open configuration;
• and
• a tightening means for gathering the wall means, the tightening means being configured to cause the convertible containment device to transform from the open configuration to a bag-like configuration having an annular opening that is nearly completely closed in the bag-like configuration.