The closest thing to the Still Suits worn by the Fremen desert people in Frank Herbert’s Dune world, set 10,000 years in the future. You hydrate more often with these because you don’t have to reach for anything; the containers can carry up to about two liters. Also they don’t bang around on the outside of your pack; the new backpacks often build in pouches to accommodate them. They make insulated ones that don’t freeze, which I use for snowboarding.
A cool tool is anything useful that is superior to comparable items. If you think this tool is inferior suggest a better one. You are welcome to insult a tool, but comments containing insults to individual people will be deleted. Corrections of fact are always welcomed, if stated politely. Recommendations of better tools are dearly wanted and may be elevated to the front page.