Instead of throwing them away, why not keep a few on hand? Just toss it in a jar or cover with a lid and it will transform your herbs and spices. If you find your backpacks becoming less efficient, you can bake some silicone in the oven (don’t forget to take it out of the paper packaging) and recharge!
In addition to being used in the kitchen, silica gel bags can be used for many things you use throughout the day.