Is the Cosmo Backpack good for carrying a laptop?

Probably not as a primary laptop bag. Print-on-demand backpacks of this type usually lack a padded sleeve, so a laptop sits loose against your back. Use a separate sleeve if you carry one daily.

What material is it made of?

Most printed backpacks in this category use polyester or a polyester-cotton blend with a printed panel. Check the product listing for the exact fabric and lining before buying.

How much does it hold?

Expect a typical casual daypack capacity, enough for a jacket, lunch and a book or two. Confirm the listed dimensions if you plan to use it for school or travel.

Is it water-resistant?

Usually not. The fabric may shed a light drizzle, but seams and zips are rarely sealed. Carry a rain cover or dry bag in wet weather.

Is it worth buying over a branded daypack?

Only if the design is what you want. A branded daypack gives you better padding, warranty and water resistance; this one gives you a print you will not find elsewhere.

Can I return it if the size is wrong?

That depends on the marketplace seller's policy, since print-on-demand items are often made to order. Read the return terms on the listing before you order.