I use a "cordless dehumidifier" that contains about a pound of silica beads and has a built-in heating element to reactivate the silica after it gets saturated. I have found that these weigh about 480g after being heated to constant mass, and about 530g when saturated. I had one of these in a 2 qt lock&lock container for 6 months and it absorbed 10g of water (a fifth of its capacity). If that's the performance you get out of a pound of desiccant in a small container, imagine how insufficient a small packet is in a large container.