It is a military book bag with the characters 为人民服务 “Service to the People” hand-embroidered on the flap.
You can see a similar bag in the print here.
The two buttons on the left are the same image, the colored one is 2″ (5 cm) in diameter and the smaller one is 1.5“ (3.8 cm). The back of the large button reads, “Celebrate Chairman Mao Longevity and Limitlessness.” The button on the right…
It is a postage stamp with an image of Mao Zedong with Lin Biao looking out toward the Tiananmen Plaza from atop the Tiananmen Gate. This is one stamp from a set of two. You can view the other here. Click to like.
A revolutionary teapot with the slogan “Service to the people” on the back.