Waterproof sack that can also be used as a pump. It reliably protects the mat from moisture and dirt. The bag has a hole with a valve at the bottom, so it can also be used as a pump for a self-inflating mat or burette. This use is especially suitable in cold environments, where only dry air needs to be blown into the mat, and it is therefore not appropriate to blow the mat through the mouth (moist air from the lungs). This increases the insulation capacity and prolongs the life of the mat. Suitable for all models of self-inflating and inflatable mats, except for models that cannot be folded in half and the model: Caliman, Lectus, Scout and Azur.