For United States shipments, SlimSation currently uses UPS (United Parcel Service). UPS will ship to a rural post office box, but will not deliver to a standard USPS Post Office box. UPS Ground delivery is guaranteed within 7 – 10 days. However, SlimSation has found that shipment using this method is usually much faster – SlimSation's usual shipping door-to-door averages 3 to 5 business days.