Put your slime into another airtight container. Please consider ordering Priority Mail shipping, as insurance is included in this service. We package your orders carefully in sturdy containers and bubble wrap, but we can't guarantee that the containers will arrive unbroken. We have no control over how the postal service will handle them, or that they won't freeze in winter weather. (Frozen slime is fine, just let it thaw completely before playing with it) If you've ordered shipping with insurance, do keep all parts of your order and packaging, and take pictures showing the breakage, plus pictures of the front, back and inside of the package. These will be needed for your insurance claim if you've purchased insurance. Most slimes will still be in their containers and in very good condition, even if the container is cracked. If your container is cracked when you receive it, we suggest putting your slime in another airtight container to preserve it, we will not replace a broken container.