Most important part of using those packets...DO NOT EAT!
I crack up every time I get a new pair of shoes and see the little pack. What freakin idiot got shoes, saw that pack of desiccant and thought, " I need to sprinkle this stuff on my burger tonight."...JJ
My dad says one is fine <He used to work for a company that produced the packaging for commercial stuff>. It's really a matter of how long the dessicant keeps doing it's job. For 2 pounds you could do 2 to be safe. This is based off those small packages like you'd find in a package of gas station jerky.