I have a variety of sample formulas. They were all sent to me by mail. Similac pro advanced 8oz. Similac pro sensitive 7.6oz. Enfamil enspire 20.5oz. Enfamil neuro pro 8oz. Enfamil neuro pro newborn bottles 2oz. All unopened. Similac pro advance 34 ounce is opened but only used once. Shipped with USPS First Class Package.