Domestic Shipping Prohibitions, Restrictions, & HAZMAT

When you mail a letter or send a package, you must follow U.S. and USPS® guidelines. Learn what things you can and can't send in the U.S. mail:

  • Some items are prohibited (completely forbidden).
  • Some are restricted (allowed under certain conditions).
  • Hazardous materials (HAZMAT) might be prohibited or restricted.

If you're shipping internationally, see International Shipping Prohibitions & Restrictions.

Reminder: 水银(一种在室温下呈液态的银色金属)是禁止携带的,不能邮寄, whether by itself or in devices like antique thermometers, barometers, and switches. However, items that contain small amounts of mercury vapor, like compact fluorescent lamps, can be mailed domestically. Learn More

Mailer Guidelines

All USPS customers are responsible for:

  1. Reviewing USPS Publication 52, Hazardous, Restricted, & Perishable Mail to find out if your item is mailable.
  2. Complying with Postal Service regulations and U.S. laws and regulations.
  3. Packing your package securely and marking it as required. You can take your package to a Post Office location to make sure it is labeled correctly.

Shipping Hazardous Materials (HAZMAT)

危险物质是指如果处理不当可能会伤害到人或造成损害的物质, like chemicals or flammable items.

HAZMAT also includes lithium batteries (like the ones in cell phones and electronics; they contain a lot of energy and can be a fire risk) and liquid mercury:

  • 有些有害物质是被禁止的——你不能通过美国邮政总局发送,必须使用其他承运人.
  • Other HAZMAT is restricted—you can mail it if you follow all the rules.
  • 有些有害物质只能通过地面运输运输,不能用飞机运输.
  • If you are mailing packages that contain hazardous materials (HAZMAT), 您必须将有害物质包装与所有其他包装分开,并将其放在标有“有害物质”的容器中."

If you knowingly mail materials that are dangerous or injurious to life, health, or property, for each violation, you face a civil penalty of at least $250 (but not more than $100,000), the costs of any cleanup, and damages. You may also face criminal penalties.

TIP: Try our tutorial on sending hazardous materials, HAZMAT Shipping Safety.

Domestically Prohibited Items

You can't send these items in the U.S. mail:

Domestically Restricted Items

You can send the following items if you follow all the rules and restrictions. See a more complete list in USPS Publication 52, Hazardous, Restricted, & Perishable Mail.

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Open or Close content below Aerosols

可邮寄气体和气溶胶的例子包括丙烷、丁烷和灭火器. 确保你阅读了发送可邮寄气体的具体规则和限制.

List of Mailable Gases

Open or Close content below Alcoholic Beverages


Please note, if you want to reuse a box that has alcoholic beverage labels on it, remove all logos and labels so your package will pass through the mail system.

Exceptions for Mailing Intoxicating Liquors

Open or Close content below Cigarettes, Cigars, & Tobacco

香烟和无烟烟草是限制物品,只能在有限的情况下邮寄. Cigars may be mailed domestically. Customers are advised to review the Cigarettes, Cigars, and Tobacco Definitions and Mailability.

Exceptions for Mailing Cigarette & Smokeless Tobacco


  • Intra-Alaskan and intra-Hawaiian shipments
  • Business/regulatory purposes
  • Small-quantity “gift” shipments to individuals
  • Individual returns of an unacceptable tobacco product to a manufacturer

Other Shipping & Packaging Requirements

允许的香烟或无烟烟草运输必须由邮局的邮政员工批准. 邮政员工将核实个别收件人是否达到接收货物的法定年龄.

Tobacco Shipments to APO/FPO/DPO

When shipping to APO/FPO/DPO locations in foreign countries, USPS treats the mail as domestic mail, 但航运仍然受到这些国家的禁止和限制. 客户应该意识到尺寸和重量标准可能与USPS标准不同. See International Country Listings to find country-specific prohibitions and restrictions.

Open or Close content below Cremated Remains

USPS® 是唯一一家运输火化遗体(人类或宠物骨灰)的航运公司吗?. 您可以在国内运送火化的遗体,但必须使用特快专递®. Make sure the inner primary container is strong, durable, and properly sealed. For the outer shipping package, you must use one of our two Cremated Remains Kits or use your own strong, 耐用的容器妥善包装和标签的火化遗骸标签139在所有四个方面的盒子, plus top and bottom. Order free cremated remains shipping supplies on The Postal Store®.

Watch How to Ship Cremated Remains Safely Video
Publication 139 - How to Package & Ship Cremated Remains
Other Guidelines on Shipping & Packaging Cremated Remains

Open or Close content below Dry Ice

当干冰被用作制冷剂来冷却可邮寄的危险或无害材料的内容时,允许邮寄干冰. 含有干冰的包装必须装在允许释放二氧化碳气体的容器中.

Shipping Dry Ice Rules & Restrictions

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Only licensed manufacturers and dealers may mail or receive handguns. Even though unloaded rifles and shotguns are mailable, mailers must comply with applicable regulations.

Additional Information on Mailing Firearms

Open or Close content below Glues

Glues have a wide range of flashpoints. 你有责任知道你想要邮寄的胶水的闪点和毒性. Flammable glues may be mailed if they are a consumer commodity. Some glues may only be sent by ground transportation. Glues are categorized as “adhesives” in the below resources.

Shipping Flammable & Combustible Liquids
Packaging Instructions for Combustible Liquids

Open or Close content below Hand Sanitizer

To ship hand sanitizers, including wipes, you must use USPS Ground Advantage or Parcel Select® service. These services are only available through your local Post Office branch.

Most hand sanitizers, including wipes, 含有酒精,本质上是易燃的,因此在美国作为危险物品(HAZMAT)处理和运输.S. Mail. 由于这些产品属于易燃材料,因此只能通过国内邮件进行地面运输. 禁止通过国际邮件发送这些材料,包括APO/FPO/DPO(军事)目的地.

如果您不确定您所运输的产品是否易燃, please check with the manufacturer of the product before mailing.

Additional Resources

Open or Close content below Hemp Products (including CBD)

A cannabis-derived substance with tetrahydrocannabinol (THC) content of 0.3 percent or less is legally hemp. Cannabidiol (CBD) is a compound found in the flower resin of cannabis plants.

You can send certain hemp-based products domestically (within the U.S. and to U.S. territories) if you comply with all applicable laws. (您不能将大麻和大麻衍生产品发送到国际或军事目的地.)

To mail legal hemp and hemp-based products, including CBD, you must:

  • Follow the guidelines outlined under Publication 52, Section 453
  • Comply with all applicable federal, state, and local laws pertaining to hemp production, processing, distribution, and sales
  • Retain records establishing compliance with such laws, including laboratory test results, licenses, or compliance reports, for no less than 2 years after the date of mailing

Open or Close content below Lithium Batteries

For domestic mailings only, 小型消费型初级锂电池或电池(锂金属或锂合金),如用于为相机和手电筒供电的电池,在某些条件下可以在国内销售.

Lithium Batteries in Electronic Devices

If you're mailing pre-owned, damaged, 或含有或包装有缺陷的锂电池的电子设备, you must send them via ground transportation; they are prohibited in air transportation.

These devices must be marked on the outer packaging with the text, "Restricted Electronic Device" and "Surface Transportation Only."

Shipping Lithium Batteries

Open or Close content below Live Animals

除非在有限的情况下,宠物和温血动物不得邮寄. Shipments of live animals, including poultry, reptiles, and bees, have very specific packaging requirements. Although you can drop these animals at any Post Office 只有在合适的运输工具可用时,它们才会被运送.

Regulations on Shipping Live Animals

Open or Close content below Matches

Safety Matches

安全火柴是经过处理的火柴头,只有在擦到特别准备的表面(如火柴盒)时才会点燃, card, or box. 安全火柴必须通过地面运输,不能国际邮寄.

Additional Information on Mailing Safety Matches

Strike-Anywhere Matches

Strike-anywhere matches will light from friction against any surface. Strike-anywhere matches may not be mailed domestically.

Open or Close content below Medicines & Prescription Drugs

When sending medicine or drugs through the mail, 寄件人和托运人必须知道他们所发送的物品的特征,并正确对待它们. Medicines are controlled substances and are subject to strict regulations. 处方药只能由美国缉毒局(DEA)注册的分销商邮寄. Similar regulations apply to some over-the-counter medications.

Shipping Controlled Substances & Drugs

Open or Close content below Mercury

Mercury is a toxic metal that’s a shiny, silver liquid at room temperature. 它经常出现在温度计、气压计、恒温器和开关等古董设备中.

Liquid Mercury

美国邮政禁止携带任何数量的液态汞(以及含有可见量汞的设备), so you must find another carrier.

Mercury Vapor Devices

一些消费设备,如紧凑型荧光灯,含有微量的汞蒸气. These items are restricted, but mailable. See Pub 52, Section 348.22g and Packaging Instruction 8C for more details.

Open or Close content below Nail Polish

If the nail polish you want to mail is flammable, you are responsible for knowing its flashpoint and toxicity. 易燃指甲油如果是消费品,可以在国内邮寄. Some nail polishes may only be sent by ground transportation.

Shipping Flammable & Combustible Liquids
Packaging Instructions for Combustible Liquids

Open or Close content below Paint

一般接受邮寄易燃或可燃油漆及与油漆有关的物品, 只要材料符合消费品材料或ORM-D(仅用于表面), and is sent within the quantity limitations and packaging requirements. 乳胶漆或类似的不易燃或不可燃的水性涂料产品不被列为危险材料, and therefore, is not restricted.

Additional Information on Mailing Paint

Open or Close content below Perfumes

含酒精的香水不得国际运输或国内航空邮寄. Perfume containing alcohol, however, may be shipped within the United States by ground transportation.

Shipping Flammable & Combustible Liquids
Packaging Instructions for Combustible Liquids

Open or Close content below Perishable Items

Perishable items are materials that can deteriorate in the mail, such as live animals, food, and plants. Permissible perishable items are sent at the mailer’s own risk. 这些物品必须特别包装和邮寄,以便在它们开始变质之前到达.

Shipping Perishable Materials Guidelines

Open or Close content below Poisons

Poisons are considered toxins. 你有责任知道你想要邮寄的材料的毒性. Some poisons may be sent by air and ground transport, others only by ground.

Mailable Class 6 Materials
Packaging Instructions for Toxic Substances