Abstract: An improved portable and foldable shelter comprising a structure of tubular members and cross-members forming an assembly having side walls preferably tapered inwardly, a roof or top, and a covering complementary in shape to the assembled structure. Elongated containers are secured to the walls of the shelter and are capable of receiving a heavy substance such as water, sand or elongated segments of heavy material. The containers may be elongated pockets, secured to or incorporated to the shelter, preferably to the covering or incorporated in the side walls of the covering, and located substantially at the lower end of the side wall adjacent to the supporting surface so that the lower portion of the containing means may be close to or touch the supporting surface thus preventing the passage of air or wind underneath the side walls or the floor of the shelter.