1Equipped with thick double shoulder straps, it can reduce the burden on the shoulders, compact and portable. 2The surface is smooth and flat, and the edges are stable, which is convenient for sketch painting. 3Use rainproof oxford fabric to prevent the paper from getting wet when it rains. 4The strap suture is firm and can be flexibly adjusted to the appropriate length. 5It can be used as a picture bag, drawing board, can hold sketch paper, pen and other utensils.