First of all, order>$60, you can choose a S size box. Order>$120 is M SIZE. order>$180 is L SIZE, which is based on you purchasing the products one by one, excluding the mystery box and any set containing deco-box.
When you choose the stuff in the cart over $60 /$120/$180(after using coupon code ),pls follow the step below
you just choose the box for over $60/ $120/ $180 . it will be free once you order over the amount. but if you forget to choose by yourself, we still will send a random one with your order.