Survival knives can be used for trapping, skinning, wood cutting and other uses. Hunters, hikers, and outdoor sport enthusiasts use survival knives. Some survival knives are heavy-bladed and thick; others are lightweight or fold in order to save weight and bulk as part of a larger survival kit. Their functions often include serving as a hunting knife. Features, such as hollow handles that could be used as storage space for matches or similar small items, began gaining popularity in the 1980s.