We have designed a flip cap that offers easy one handed operation. This feature is available in 2 devices. Again the only difference between our Cupid2 and SheWhizz2 is the volume of urine it is able to hold. The Cupid2 is our 2oz device and the SheWhizz2 is our 1oz device. THis product is for use when you do not want to leave anything behind ( flow restrictor ). Everyone has a preference and we aim to meet your needs.