By mistake i locked my american tourister bag,and i cannot open this bag i forgot this three digit password

SOURCE: By mistake I have locked my american tourister luggage bag and now I can not open it I forget the 3 digit combinations. How I can unlock it

Few standard combination locks are machined to such a high degreee of precision that when the lock is put under strain one or more of the numbered rotating dials is not left a little loose while the other(s) become tight.

It is a matter of slowly turning the tight dial or barrel until it becomes loose. At this point the lock will move a little as long as it is kept under strain and one of the other numbered barrels that was previously a little loose will become tighter and so it is time to slowly turn this barrel and repeat until the lock releases.

Practice on something like a cheap cycle lock and you will discover the trick that is increasingly difficult as the quality of the lock improves.
It takes a light touch and lots of patience. So far I have even opened a quite expensive combination padlock this way but it relies on imperfect manufacture. It would be quite impossible to use the technique on a perfectly made combination lock.