To provide an environment friendly ecobag which can be repeatedly used at a food sales floor in a department store, a super market, etc., and used again for carrying articles put in without discarding after use targeting on extremely reducing waste incineration to prevent destruction of global environment by waste incineration these days.

Piano wires 1a, 1b for expansion are sewed into the circumferential edge part 8 of a bag 10. Anyone can easily open the bag inside a basket 9. The piano wires 1a, 1b are put together to roll up the bag 10 to reduce the shape to the minimum when the bag 10 is not used and the bag is housed in a carrying bag 14.