Visit the Team Iceshanty Proshop
Chlorine tablets come in them, check with a few pool owners.
I bought a 7 gallon from here last yearhttp://www.usplastic.com/catalog/item.aspx?sku=2389&gclid=CjwKEAjww8eiBRCE7qvK9Z7W_DgSJABfOjf2BPggvv4E8kSa2PSlv5PRziZpXUW62UI5WSS10vQKgBoC-6_w_wcB