To prevent the damage of the bottom part of a bag for housing a long-length matter such as a fishing rod etc. and to prevent the side slip of the bag in the case of leaning it against a rock place, the ground surface, or the like.

As for the bottom body of this bag, protective materials consisting of soft resin and having projection parts toward side parts and projection parts toward lower sides are arranged and fixed to the corner parts of a box which has an open top.