There are 2 ways you can store Reptichip:Break off what you need and just expand that (be sure to use less water than you think...it's always easier to add more water later). You can store the rest of the dry block for use indefinitely.Expand the whole block in a large container or tote, and use just what you need. For this you can store the constituted block, however you will want to leave the lid off of the top to allow the moisture to evaporate. Give it a hand toss every few days to allow the chip to aerate until dry. When it comes time to replace your Reptichip, just add a bit more water to the amount you need and you're in business!