Have you ever noticed those little packets inside shoe boxes and coat pockets, and the little packets are labeled with the warning “Do Not Eat?” It’s comical to think that someone old enough to know how to read would consider eating the contents, and a child too young to read obviously cannot heed the warning. The content of those little mystery packets is silica gel. Silica gel isn’t gel at all. It’s a granular substance that absorbs moisture. Silica gel is actually the most absorbent product available, and amazingly it can absorb up to 40% of its weight.