LEGO has several standard box sizes in which they ship elements. Common sizes are K8, K6, and K4. A K4 is a little bigger than a shoe box. Pick-A-Brick stock typically comes to the stores in K4 boxes. A K8 is 16″x24″x12″ (40x60x30 cm). A K6 is in between the two.
This page will list building standards. This category collects articles about companies that operate under the LEGO name as well as their subsidiaries and partners.