This is a 425-round milk carton of CCI Blazer .22LR 38-grain target ammo.
Blazer 22 Long Rifle ammo is loaded with a 38-grain bullet that’s great for everything from small game hunting to casual plinking. The loads cycle particularly well in semi-automatic rifles.
You can take the box to the range, empty the ammo, and flatten the carton for a built-in target! Very unique.