This is what I ended up doing......
Thanks to everyone for the suggestions.
In the end, this is what I have decided to try. I have twelve (12) 155 ounce boxes of Cascade with Shine Shield. At Wal-Mart, I bought three (3) boxes of the Medium size “Original Space Bag” Vacuum-Seal Storage Bags - each box contains 2 bags. For a little protection of the sharp corners of the Cascade boxes rubbing directly against the Vacuum-Seal bags, I triple wrapped each box of Cascade in plastic grocery bags. Two of these 155 ounce Cascade boxes just squeeze perfectly into one Medium sized Vacuum-Seal bag.
The Tot Box will be stored in the basement, with its own lid - unfortunately, I cannot vacuum-seal the tot box itself.
At my present dishwasher detergent usage level, I am guessing that this is about a 10 to 12 year supply. If the “experiment” works, then I will be very happy in a few years from now. And if it fails, I am not out of a huge investment.
Oh, and after my initial purchase of five (5) boxes of the Cascade at a Super Wal-Mart in East Peoria (I cleaned off their shelf of this size box), the next time I went back to buy more, the shelve had been restocked with the new, Phosphorus-Free Cascade. I thought, Oh, Shit - they are making the switch already, ahead of the July switchover. Fortunately, I drove to another Wal-Mart in Peoria, and the still had several boxes of the original on the shelf. I bought six (6) more boxes. When I got home, I discovered my mistake of being 1 box short. I skipped a couple of days and went back to the 2nd Wal-Mart, and damned if they had not restocked with the new Cascade. Fortunately, in the back I could see the bright green boxes of the original - 2 boxes left, so I grabbed both.
Lesson learned - if you are buying the old Cascade, go ahead and buy what you think you will need, because the new Cascade is already out there.
Thanks again.
Mike
