I am working on the Treasure chest achievement but I am wondering How do you add more spaces?? It says I need 10 but I can only put 5 in right now. Jen

sold in the millionaire center is the cheapest way, it gives out 1-3 spaces

ok Thanks :)

You can also get random events that increase you treasure size so you should keep an eye out for them. The fewer pets you have the more likely it will hit the right pet when you get that event. You can also purchase a Multi-Compartment Keepsake Box from the cash shop. That will give you 10 spaces. Its just more expensive to buy.

I've just been letting RE's increase it. I'm at 24.