I've been using the Cupohus 25" x 37" portfolio bag for about a month now, and I have some thoughts. First off, the size is perfect for my 24x36 artwork - it fits with room to spare, just like the product description claims. The outer pockets are super handy for storing pencils, erasers, and small sketchbooks while I'm on the go.

The waterproof feature has been a lifesaver during rainy commutes to my art class. I got caught in a downpour last week, and my artwork stayed completely dry inside while the outer fabric beaded water nicely. The material feels sturdy at first glance - much better than standard canvas bags I've used before.

However, I have some concerns about durability. While mine hasn't ripped yet (knock on wood), I'm being extra careful after reading other reviews about tearing issues. The zippers feel a bit flimsy compared to the rest of the bag's construction, so I always open and close them gently.

For storage, I followed another reviewer's tip and inserted a stiff cardboard panel inside when storing flat works. This helps maintain shape when storing under my bed or in tight spaces. The bag folds surprisingly compact when empty too.

Overall it's serving its purpose well for now, but I'm not sure how long it will last with regular use. If you need something temporary or for light use, it's decent - but heavy users might want something more heavy-duty despite the appealing price point.