This size is for portable on-the-go artwork. It is definitely worth the inexpensive cost. I have, and still do, used almost every paper including arches on this planet.

The paper holds a lot of water and pigment without buckling because it is glued on all 4 sides, minus a little pocket in the back for you to insert a palette knife for easy removal. My paul rubens watercolor pigments do not dull after drying.

All the sheets are glued together along all the edges. The pages are compressed like a brick. If you manage to get them apart they are wavy and worn looking which is not what anyone wants when drawing or writting. The glue is absolutely unnecessary.