In Greece, we call "monkeys" all the products that are imitations. For example, a LV bag which is sold out in the street we call it "monkey" and we pronounce it "mymoo".
In the photo, Nigerian immigrants carry their merchandise (mostly mymoo bags but also wooden crafts, clothes and souvenirs) away while the police is raiding their positions in Christmas Athens. The sheet is very convenient. It allows them to wrap everything into seconds, make their way around the block and return to their spot.