Design nitpick: The alert every time you add something to your cart is really annoying. What if I want to add 4 backpacks and 3 water purifiers, etc... I click add, get a pop-up, click ok, then add again, rinse repeat....
Maybe instead just use a floating div to appear, say xyz has been added, and then fade away after a second.
Maybe instead just use a floating div to appear, say xyz has been added, and then fade away after a second.