Expandable sling bag

A method for stowing a portable computer in a sling bag, comprising:

• opening a bottom opening in a bottom of the sling bag;
• extending an expandable base through the bottom opening;
• introducing the portable computer into a secondary opening in a top of the sling bag, at least partially through a secondary receptacle, through the bottom opening, and into the expandable base, with a first edge of the portable computer extending beyond the top of the sling bag, the first edge of the portable computer or a first edge of a sleeve covering the portable computer exposed beyond the top of the sling bag, and a second edge of the portable computer therein extending beyond the bottom of the sling bag;
• and
• securing a retention system in place over the first edge of the portable computer protruding beyond the top of the sling bag, including extending over only a portion of the secondary opening, from a back of the secondary opening to a front of the secondary opening, and securing a strap in place over the first edge of the portable computer and the secondary opening.

In combination,

• a portable computer comprising a laptop computer or a tablet computer and having a first major dimension comprising one of a length and a width of the portable computer and a second major dimension comprising another of the length and the width of the portable computer, with the second major dimension being the same as or larger than the first major dimension;
• a sleeve for carrying the portable computer and having a first major dimension that receives the first major dimension of the portable computer and a second major dimension that receives the second major dimension of the portable computer;
• a bag body having a back, a front, side edges, a top, a bottom, a width, and a height, with the width of the bag body exceeding the height of the bag body and the width of the bag body being larger than the first major dimension of the sleeve and the height of the bag body being smaller than the second major dimension of the sleeve, the bag body including:
• a primary receptacle accessible through a primary opening in the top of the bag body;
• a secondary receptacle accessible from a secondary opening in the top of the bag body, the secondary opening having a length and the secondary receptacle having a width that enable the secondary opening and the secondary receptacle to receive the first major dimension of the sleeve;
• a bottom opening beneath the secondary opening, the bottom opening having a length that enables the bottom opening to receive the first major dimension of the sleeve;
• and
• a bottom closure for the bottom opening;
• and
• an expandable base extending across a bottom portion of the secondary receptacle, collapsible within a bottom portion of the secondary receptacle, accessible from the bottom opening of the bag body, and extendable through the bottom opening of the bag body to expand the secondary receptacle through the bottom opening when the bottom closure is open;
• and
• a retention system comprising a strap extendable over only a portion of the secondary opening in the top of the bag body, between a rear location adjacent to the back of the bag body and front location toward the front of the bag body, the strap securable in place over the secondary opening.