Among the various bowel segments studied, the ileum is ideal for ONB creation. A spherical reservoir, reconfigured from a de-tubularized ileal segment, offers the most desirable attributes like, adequate capacity, low intraluminal pressure, and good compliance. The patient of ONB reported 4-25% rate of clean intermittent self-catheterisation (CISC) for incomplete emptying. Daytime incontinence was present in 13% of patients. The rate of nocturnal incontinence is usually higher in the range of 15-40% in recent metanalysis. The success of ONB rely on detubularization of intestinal segment, sufficient capacity and proper configuration and position in the pelvis. Adequate capacity is achieved by using sufficient length, folding, and creation an ellipsoid or spherical configuration. The ONB should hold approximately 500 cc of urine at low pressure (at < 15 cm H2O), empty completely (< 100 cc urine), four to five times daily and allow the patient to sleep without awakening, while maintain normal body image