Yup that’s right “Bivi-Sack”. This is my tent while kayaking and camping. Handy sack for my sleeping bag. Has a mosquito netting to keep the bugs out and Gore-Tex waterproof top and Nylon bottom. Works great in the rain-forest for keeping me dry. When kayak camping I place it on top of my folding camp cot and throw my sleeping bag in and I am set. The “Bivi-Sack” ways 1lb by it self and will fold to the size of a block of butter and came with a bag. TOO COOL! If you ever need something lightweight and compact this type of sack will do well. I have used it in the rain-forest on Vancouver island while hiking the West-Coast Trail 20 years ago and it still serves me well. I have also used it while sleeping in a snow cave in the winter on top of Apex Mountain. Won’t go camping without it.