I purchased 2 of these, 1 for dog food and 1 for cat food. It is massive. I could easily fit an entire bag plus some for dog food. For the cat food, it was just way too big. We exchanged for the smaller one for the cat and kept for the bigger one for the dog, but the sheer size surprised me. I love the wheels on it. It seems sturdy. Haven't had any issues to date. Moves easily around for us. It does save us room though, despite the large-ness of it. I think it will keep the food fresher longer than just staying in the bag, but I wouldn't say its airtight by any means. My dog doesn't care though. He eats his own poop, so fresh dog food isn't really important. My cat doesn't seem to care either, so win-win!.