I think these blocks will hold up very well. The cardboard is quite strong and completely non-porous. I've had some pretty tough times getting some of them to fold properly and fit into holes, so there are a few blocks that look a little torn around the edges. The top part of the oddly shaped observation tower was particularly tricky, even though I folded everything before assembling it. It was just difficult to type in some of the tabs correctly. Disappointing for me but worth it for my grandson. He likes to build a town for his Paw Patrol cars to drive around. Just note that they take up a lot of space. I kept the box for the photos, but of course you can't use it for storage. I ended up using some old laundry baskets.
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