Two sizes available.The liner is 45 x 82.7inch(115 x 210cm)/ 63 x 82.7inch(160 x 210cm) which gives even tall people space to move around and stretch out the legs.It can be travel sheet, lightweight sleeping bag, travel sleeping sack thanks to its good humanized size.^ The sleep bag liner has a 39" (100cm) opening on one side to make it easy for you to get into. It can be used alone as a sleeping bag for separate dirty things, or used as a liner in down sleeping bag,or as a hotel sleeping sack. Keeps you comfortable throughout the night.^ The sleeping bag liner is made of premium polyester with a silky texture which makes it very soft and comfortable against your skin. Unlike normal cotton fabric, easy to crinkle. This new type of fabric no crinkle, no pilling or fade, can be used for a long time.^ Only 1.26 lb (573g), incomparable lightweight and compact. Despite its generous size the sleeping bag liner can be folded into a practical 21x21cm (8.3x8.3") pocket when not in use. Easy to carrying and saving pace in your backpack.^