Fast backpacking and walking made a lot lighter. Bivi bags have changed the way of lightweight travel to. Bivi bags fit over a sleeping bag to keep it dry. The  one-man tent types can have mesh for summer breezes and to keep midges at bay.. Some new bags have been redesigned to save save weight. Bashes and Bivi bags are often use to compliment each other. Bashas can be used as an emergency shelter and with the bivy bag can make for a comfortable nights sleep
Special Forces have long used Bashas in survival courses. and real life. The advantages of bashas compared to traditional tents are faster and easier set-up,with great wind resistance and are very small pack size. Bashas are used for emergency and  camping where a tent maybe too heavy to carry. These are usually hung between 2 posts or trees and a hammock can be slung below for comfort and dry sleeping.