PURPOSE: To provide a school/travel bag with tough handles which is usually used as a school bag, but can be used also as a travel bag with a large capacity for a school trip or ski tour, and whose bottom board is always on the bottom of the bag whether the bag is enlarged or not.

CONSTITUTION: The width of the bag 2 can easily be widened or narrowed by zipping/unzipping zippers 12a and 12b on both sides 7a and 7b and the bottom 8 of the bag 2. Two bottom boards which can easily be slid are on the inner bottom 8. The base parts 19a and 19b of a pair of handles 3 are sewn on the front surface 5 or the rear surface 6 and are fixed by clasps 20.