Overview

A backpack—also known as a rucksack, knapsack, bookbag, Haversack or Bergen—is a bag designed to be carried on a person’s back. It typically has two shoulder straps that distribute the load and keep the bag close to the wearer; the basic configuration is the familiar pair of shoulder straps. Backpacks serve to transport books, clothing, tools and personal equipment while keeping the hands free.

Design and main parts

Modern backpacks vary from simple sacks to complex load-carrying systems. Most include several pockets and compartments to organise items. Common elements are:

  • Shoulder straps: padded and often adjustable to fit torso length.
  • Hip belt: transfers much of the load to the hips for heavy packs.
  • Back panel and frame: frames can be internal, external or absent; they shape the pack and help distribute weight.
  • Sternum strap and load lifters: stabilise and fine-tune how the bag sits.
  • Compression straps, daisy chains and attachment points: secure gear externally.

How carrying works

For light daypacks the weight is borne mainly by the shoulders, but larger packs are designed to move most of the load onto the hips through a padded belt. This reduces shoulder strain and improves balance because the carried mass sits closer to the wearer’s center of mass. Properly fitting a pack—measuring torso length, adjusting hip belt position and tightening load-lifter straps—reduces fatigue on long walks or climbs.

History and development

People have carried goods on their backs for thousands of years. Early carrying containers were made from natural materials, such as animal skins stitched together and woven fibres, and were used for transporting game and supplies. Hunters and gatherers sometimes butchered large animals into pieces to distribute weight across several carriers; skin bags and straps were practical solutions. Over time, designs evolved into specialised forms for military use, exploration and recreation, and materials changed from leather and canvas to synthetic textiles like nylon and Cordura.

Types and common uses

Backpacks are tailored to purpose. Typical varieties include:

  • Daypacks for everyday commuting or short hikes.
  • Hiking and expedition packs with larger capacities, sternum straps and hip belts for multi-day trips; these are popular for hiking and camping.
  • Technical packs for climbing, skiing or cycling, featuring specialised attachment points.
  • Hydration or bladder packs that include a reservoir and drinking tube for sports.
  • School and laptop backpacks with padded sleeves for electronics and organisation pockets.
  • Military rucksacks built for durability and load carriage in harsh conditions.

Care, selection and notable distinctions

Choosing a backpack depends on capacity needed, fit, intended activity and durability. Materials and construction affect weight and weather resistance. Frameless packs are lighter but best for modest loads; framed packs improve comfort with heavy or irregular cargo. Maintenance is straightforward: clean according to the manufacturer, keep zippers and straps functional, and replace worn padding or webbing. Specialized packs (for laptops or hydration) trade general capacity for protection or convenience.

Backpacks remain one of the most versatile personal carrying systems for education, travel, outdoor recreation and professional use. Their continued evolution reflects advances in materials, ergonomics and the diverse needs of users.

Definition reference • Strap detail • Compartments • Camping • Hiking • Center of mass • Historical practice