This pack from Maxpedition Hard Use Gear fits securely at your waist and does not keep you from moving around freely. There are two main compartments and multiple pockets so you can store a lot of gear and tools. The material is water resistant to keep everything dry.
Specifications and Features:
Main compartment dimensions: 9 inches wide on top, 7 inches wide at bottom, 5 inches high x 3 inches deep
Main compartment features: mesh and cloth dividers, dual zipper flap opening, drainage grommet
Front compartment dimensions: 6 inches x 5 inches x 1.5 inches