A tech pack includes detailed flat sketches of the garment (front, back, and sometimes side views) that clearly show the shape, proportions, and design features. It contains precise measurements for each size, known as a size spec or measurement chart, which defines how the garment should fit and how it is graded between sizes.

The document also lists all materials required, including fabric types, fabric weights, color codes, trims, zippers, buttons, elastic, and thread colors. Construction details, such as stitch types, seam finishes, hem styles, and reinforcements, are specified to ensure the garment is assembled correctly. Label and tag placements, including brand labels, care labels, and size tags, are also indicated with exact positions.