I recommend FIFO bottles for Ultrasound gel for their excellent design and great quality. They have a perfect size and are easy to use. They are easy to refill, and the oldest gel sits at the bottom as they are designed with the dispenser at the bottom. This means no wasted product and no more shaking the bottle or flipping the lids open/closed. These bottles also allow dispensing of the gel quickly and easily without waste due to the tight seal and they are easy to clean.