Single-bag pack for everyday carry and for travel

A single-bag pack, comprising:

• a back panel configured to fit against a back of individual;
• a harness attached to the back panel and configured to fit a shoulder of an individual to support the pack on the back of the individual;
• a computer compartment defined by a first substantially rectangular space formed between the back panel, a first wall, and a first section of exterior material between the back panel and the first wall;
• a first zipper in the first section of exterior material forming a first zippered opening into the computer compartment to facilitate insertion and removal of a laptop computer through the first zippered opening;
• an expandable travel compartment defined by a second substantially rectangular space having first and second long edges and two short edges and formed between the first wall, a second wall, and a second section of exterior material between the first wall and the second wall;
• a second zipper in the second section of exterior material along the first long edge and the two short edges of the expandable travel compartment and forming a second zippered opening into the expandable travel compartment, such that when the second zipper is closed the expanded travel compartment is closed, and when the second zipper is fully opened the second long edge forms a hinge such that the second zippered opening forms a suitcase-opening lid and the expandable travel compartment is directly accessible through the second zippered opening;
• an expansion zipper in the second section of the exterior material, wherein the expansion zipper has a first side connected between a first part of the second section of the exterior material and a first edge of an expandable gusset, and wherein the expansion zipper has a second side connected to a second part of the second section of the exterior material and a second edge of the expandable gusset, wherein the expansion zipper extends completely around the pack, and wherein the expandable gusset has a width and forms a loop extending completely around the pack between the first and second sides of the expansion zipper, such that when the expansion zipper is closed the expandable gusset and expandable travel compartment are compressed, and when the expansion zipper is fully opened the expandable gusset and the expandable travel compartment are expanded the width of the expandable gusset such that the expandable gusset forms interior and exterior sides of the expandable travel compartment;
• wherein the second zipper is in the first part of the second section of exterior material nearest the first wall such that the suitcase-opening lid includes the back panel, the computer compartment, and the harness;
• a personal items compartment defined by a third substantially rectangular space formed between the second wall, a third wall, and a third section of exterior material between the second wall and the third wall;
• and
• a third zipper in the third section of exterior material forming a third zippered opening into the personal items compartment.