The invention relates to an endosurgical extraction bag for collecting body tissue or body fluid, with a bag main part formed from a flexible envelope, and with a first admission opening for introducing tissue or fluid into the bag main part of the bag. Arranged in the bag main part, there is an inner envelope which is connected to the main part (bag) and opens toward the first admission opening, but adjoins the bag main part sealingly in respect of the first admission opening, and which has a second admission opening at its second end remote from the first admission opening and spaced apart from an end of the bag main part remote from the first admission opening, through which second admission opening the tissue or fluid can be introduced into the bag main part.