Why need these ?
Camping is an outdoor recreational activity involving overnight stays away from home in a shelter such as a tent, a caravan, or a motorhome. Generally participants leave developed areas to spend time outdoors in more natural ones in pursuit of activities providing them enjoyment. To be regarded as "camping" a minimum of one night is spent outdoors, distinguishing it from day-tripping, picnicking, and other similarly short-term recreational activities. Camping can be enjoyed through all four seasons.
Camping is a popular form of recreation which often involves the use of tents. A tent is economical and practical because of its portability and low environmental impact. These qualities are necessary when used in the wilderness or backcountry.Tents intended to be carried by backpackers are the smallest and lightest type. Small tents may be sufficiently light that they can be carried for long distances on a touring bicycle, a boat, or when backpacking.
Backpacking affords a maximum wilderness experience. Specialized gear allows enthusiasts to both enjoy popular local recreational spots and access the most remote locations.Technological advance and consumer interest in camping have led to lighter and more diverse backpacking gear. Improvements such as titanium cookware, ultra-light wicking fabrics, and heat-molded hip straps make for lighter loads and enhanced performance. As there is always the possibility of severe weather and injury in the backcountry, cell and satellite phones are sometimes carried for emergencies, with varying coverage.
A sleeping bag is an insulated covering for a person, essentially a lightweight quilt that can be closed with a zipper or similar means to form a tube, which functions as lightweight, portable bedding in situations where a person is sleeping outdoors (e.g. when camping, hiking, hill walking or climbing). Its primary purpose is to provide warmth and thermal insulation through its synthetic or down insulation. It also typically has a water-resistant or water-repellent cover that protects, to some extent, against wind chill and light precipitation, but a tent is usually used in addition to a sleeping bag, as it performs those functions better.