A technique for packing the perineal wound after a wide perineal dissection performed as part of an abdominoperineal resection is described. An isolation bag is filled with rolled gauze and positioned in the pelvis beneath the sacral promontory. The packing and the bag are removed on the fifth postoperative day. This technique is safe and more tolerable to patients with an open perineal wound after an abdominoperineal resection.