Purchased as a base. The entire amount is stored in two cases. I played with it only once after sanitizing my hands. No borax solution used. There are no problems at present, but the condition of the slime may change depending on the temperature and environment after shipping. If it is too soft, please adjust it with borax solution. I am taking great care, but please understand that there is a possibility of dust contamination, which is not zero. Due to the fluid nature of slime, there is a possibility of leakage or melting from the case during shipping. Shipping is done on weekends.