On the surgical day, all enrolled participants will undergo standard registration and preoperative preparation by the staff pre-operative nurse, including placement of intravenous access line and administration of standard preoperative medications. Preoperative medications (unless contraindicated due to allergy or other medication interaction) include single dose prophylactic antibiotics given prior to surgical incision, Tylenol 1,000 mg PO, Dexamethasone 10 mg IV (unless the participant has diabetes), Celebrex 200 mg PO (unless patient has a sulfa allergy, is ≥ 65 years old, weighs ≥ 50 kg, or has a CCl >50ml/min), Ondansetron 4 mg IV, and Gabapentin 600 mg PO (300 mg PO if participant is ≥ 65 years old) given in the preoperative area.11,12 Participants with a preoperative Caprini score of 5 or greater will also receive Heparin 5000 units subcutaneously for deep vein thrombosis (DVT) prophylaxis.13 The participant will be taken to the operating room. Induction, intubation, and anesthesia will be administered according to standard practice by a dedicated group of anesthesia providers. Prior to surgical incision, preoperative prophylactic antibiotics will be administered. The participant will be positioned in the dorsal lithotomy position with the lower extremities in the Allen stirrups bilaterally and the bilateral upper extremities in a tucked position. Surgical sterile preparation and draping will be performed per usual technique. Vaginal antiseptic preparation will be performed with 10% Povidone-Iodine solution. A Foley catheter will be placed prior to the start of the surgical procedure. The hysterectomy will then proceed in the usual manner. After the specimen is removed from the pelvis and the vaginal cuff is closed, a cystoscopy may be performed at the discretion of each surgeon. At this time, the randomization envelope will be opened. Participants who randomize to the backfill void trial will remain with a Foley catheter in place or will have the Foley catheter replaced, in the case that a cystoscopy is performed. Patients who randomize to the autofill void trial will be given a 500 cc bolus of crystalloid by the anesthesia team prior to leaving the operating room. All skin incisions will be closed in a subcuticular fashion and sealed with skin adhesive.