12.7mm HDD Caddy 2.5in SSD Holder Laptop Second SATA Hard Drive Enclosure Tray
Although you can buy a bigger SSD, the problem is that they are relatively expensive. Also you still have the old hard drive, HDD caddy is a very economical solution. It is 12.7mm HDD caddy, it does not fit 9.5mm or 9.0mm optical drive bay.