Put the books reasonably so that the schoolbags will not swell and the books will not wrinkle easily as follows:

1, find two pieces of cardboard or plastic board, cut them slightly larger than books, put them in the schoolbag one by one, and put the books in the middle;

2, books are staggered, that is, one book is on the left and one book is on the right, so alternating;

3, tandem, interspersed with each other, can make the two sides of the book hard, not easy to wrinkle the book.

4. Place horizontally with the opening facing upwards; Or you can turn the corner of the book upside down in class and press it by hand. That's what I do. It works well. Or you can put heavy things on it; You can also wax the corner of the book less.

Note: If the schoolbag is soft, it will roll up no matter how you put it. Try to put the cardboard on the outermost and innermost layer. Cardboard is bigger than all the books in the bag and should be better.