The invention relates to medicine, and can be used for taking wash with objects of environment with irregular surface for determining quantitative and qualitative characteristics of their microbial content.Flask for taking wash, with a body with the latching cap, characterized in that body bottle in the form of hollow regular cylinder with round bottom, is made from polypropylene; on the neck of the bottle flange is disposed, protruding beyond boundary of outer surface of bottle, on flange is semicircular recess; below is located circular protrusion with rounded flange faces for latching cap; to the mouth of the bottle by means of elastic tension is fixed latex membrane thickness of 0.18 - 0.23 mm, diameter of which is equal to diameter of bottle, in center of membrane is process hole, the external edge of the membrane along the whole perimeter has valikoobraznoe bulge diameter 1 mm, edge membrane are in recess, formed by lower surface of flange and upper surface of circular projection, intended for latching cap; cap is made of polypropylene and is a cylinder with locking face in form of ring projection on inner surface for interaction with circular projection bottle.