Most of our products, even berghia, will survive a one day shipping delay. If your order was delayed, please carefully inspect it and let us know if there are any issues so we can make it right. Phytoplankton and copepods can generally survive a two day delay without any issues. Once again, please inspect your order carefully and let us know if anything is wrong. If UPS does not deliver your order by Saturday, please let us know. Most of the time, copepods will survive a weekend at a UPS warehouse, but phytoplankton may not. Please get in touch with us so that we can ensure your 100% satisfaction!