I think they are not worth the price. Walmart has the plan containers for $9.00. I think you better off saving the extra money and buying a good portable water filter.
I agree also, except for getting them from overprice mart. I bought them at gander Mountain for $7. I fail to understand why everyone shops at Walmart and pays more for things than then do from other stores
Pretty simple math, really. My nearest Gander Mountain is 147 miles away. My nearest Walmart is 1.2 miles away. I'd need to buy alot of containers at $2 per container savings to justify the expeniture in gasoline for a 300 mile round trip.
Also for the items it carries (which is not as diverse as I would like), my Walmart in Florida always beats every local price and most prices I can find on the internet.
YMMV
Craig.