Hey there! These silica gel packets are seriously amazing for keeping your stuff dry and protected from moisture damage. You get 30 packets in the pack, each containing 5 grams of those tiny porous beads that just suck up moisture like crazy. What's really cool is they're rechargeable - when they get saturated, you can pop them in the oven at 200-250°F for 30 minutes to 2 hours, or microwave them on defrost for about 10 minutes, and they're good as new! The packets themselves are made from this special fabric using spunbond technology that's seriously effective at moisture absorption. Each 2x2.7 inch packet can protect about 600 cubic inches of space, but I always throw in a couple extra for good measure. They're perfect for protecting 3D printer filaments, guns and ammo, important documents, camera gear, jewelry, silverware - basically anything you don't want getting ruined by humidity. The beads are pure white and won't change color when saturated, so you'll need to track their usage time. They come in this resealable bag that's actually sturdy enough to stand on its own, which is super handy for storage. The company stands behind them with replacement if they don't work, which is pretty rare for this type of product. Honestly, these have saved so many of my valuable items from moisture damage - they're one of those things you don't realize you need until you start using them, then you wonder how you ever managed without!