The cloth and cloth bag: used for external and internal materials. The surface of cloth cannot have embroidery, yarn stripe to clear and uniform color, straight lines the number of yarn should be enough, and the yarn thickness should be enough to be straight (available measurement test); rubber adhesive: firmly won't take off without white glue, glue (hands after without white, keep the original adhesive force; background): people with good grain direction pull after the car won't crack. The color of the material at the same time to pay attention to whether there is reinforcement of color, especially for the color of the color is more likely to produce dyeing phenomenon, the color is not good to the finished product found all late!

Foam and sponge: used for cloth and cloth between the outdoor sports bag, the bag is not see. Mainly depends on whether the thickness of the bottom and the density is enough (a square is enough weight). Good cotton is flexible, not easy to open.

Net material: to have elasticity, good stress, not easily broken, no yarn breakage phenomenon.

Ribbon Ribbon: many types, such as plain, fine lines, pit and so on, but each kind of different specifications of the ribbon are standard weight. The outside edge is smooth, two surface is uniform, non pilling, no drawnwork and non staining phenomenon.

Zipper: garbage chain cloth and pull head quality mainly in the level to distinguish between: such as A, B, C grade level, the better the quality of the more forward. Specifications to size to distinguish: No. 3, No. 5, No. 8, No. 10, such as the size, the greater the number of specifications is also bigger. And each of the specifications of the zipper has a standard weight, the weight of the outdoor backpack is also the key to quality. Outside the main note: pull to smooth, not pull bad feeling, also not very loud voice when pulling, hand pull zipper teeth is not explosive, but also pull head in addition to large and small bottom, pull head and pull plate is not easy to pull, pull to pieces firm, not easy to pull, deformation and other phenomena, the color zipper also should pay attention to whether the reinforcement of chroma level. So as not to be easy to dye the fabric and the consequences will be serious.