OPP bag is a common packaging bag. The main components of its material are OPP: oriented polypropylene (film) and stretchable polypropylene, which is a kind of polypropylene. Different from single-sided heat sealing and double-sided heat sealing, it is often used in the following packaging. I can simply tell you that some sizes are applicable:

12*22cm is suitable for socks and small toys.

13* 16cm CD is just the right size.

15*24cm is suitable for underwear, plush toys and cosmetics.

18*26cm is suitable for thin clothes in summer or single clothes in spring and autumn.

20*30cm is suitable for single clothes, magazines, pillow towels, scarves, etc.

24*35cm is suitable for A4 paper, magazines, undershirts, trousers or two-piece thin summer clothes, bedding, thin curtains, etc.

26*35cm is suitable for single clothes or thin sweaters, pajamas, bedding, etc.

28*40cm is suitable for thick clothes, two or more sets of summer clothes, big plush toys, bed sheets and quilt covers.

30x40cm is suitable for thick clothes, two-piece warm clothes, or more than three summer clothes and schoolbags.

32*45cm is suitable for autumn and winter clothes, big clothes, schoolbags and so on.

35x45cm is suitable for autumn and winter clothes, big clothes, shirts, pants and so on.

35*50cm is suitable for big clothes, thick clothes, cotton-padded clothes, leather clothes and so on.

45*65cm is suitable for down jackets, thin quilts, pillows and babies of the same size.