TO DETERMINE IF USPS EXPRESS IS GUARANTEED OVERNIGHT TO YOUR ZIP CODE: 1) Enter your Zip code in the "Destination" box 2) Change the "Shipping Date" to the next business day 3) Click Submit If overnight service is available to your zip code, "Next Day by 12:00PM" or "Next Day by 3:00PM" will show under the Service Commitment. If overnight service is NOT available to your zip code, "2 Days" will show under the service commitment. If this is the case please do not order any inverts or fish that require overnight shipping without contacting us beforehand.