This is the smallest of the BrightLine Array pouches. 4" long, 3" wide, and about 1"deep. It has a transparent lid to make it easy to see what's inside. The red color helps you quickly differentiate between your different sized pouches. A zipper with a red cord pull goes around three sides for access. The outside bottom is covered with hook velcro which allows you to attach it to the FLEX Array Base Plate.