Hydrocollator packs should be stored in a hydrocollator unit with a consistent temperature between 150 to 170 degrees. Checking your unit’s temperature frequently will ensure the pack’s physical integrity and keep them bacteria-free. If hydrocollator packs are left at room temperature for too long, the bentonite clay could begin to dry out leaving the packs unable to reheat properly. In the instance you need to remove the packs from the heating unit for a prolonged period of time, experts recommend storing them in a freezer. Upon thawing, the packs will re-hydrate.