What Not to Pack: Prohibited Items and Awkward Choices

First separate an item that the applicable rules prohibit from an allowed item that is inconvenient or unnecessary for your trip. They need different decisions. This guide helps you reduce avoidable packing problems; it does not rank confiscation or theft rates.

First remove or confirm restricted items

• Weapons and blades: check the whole item, including concealed multi-tool blades. Knife, scissors and tool rules depend on the screening authority. There is no worldwide six-centimetre permission.
• Liquids and pastes: use each airport's container and bag rules, including any applicable medicine or baby-food conditions. GOV.UK says many airports retain 100 ml and some allow up to two litres. Do not treat a can, snow globe or solid candle as automatically prohibited solely by name.
• Fuel, gas and chemicals: a small bottle or aerosol is not automatically safe to fly. Dangerous-goods acceptance is separate from liquid volume. Some personal toiletries have exceptions; gas cartridges and other special equipment require the exact category and carrier conditions.
• Batteries: FAA requires spare lithium batteries and power banks in the cabin, with terminal protection. Some larger lithium-ion battery categories have approval conditions; “all over 100 Wh are banned” is not an accurate blanket rule.
• Vaping devices: under FAA rules they stay in the cabin or on the person, protected from activation, without charging aboard. Do not solve a cabin question by packing one in the hold.

Use the category-by-category prohibited-items guide for the jurisdiction and battery distinctions. Check manufacturer classification when a chemical is unclear. A prescription, retail package, product brand or security permission cannot replace destination import rules.

Allowed but awkward: decide by the actual trip

A fragile glass object is not automatically better protected in checked baggage. Nor is every mirror or glass item a banned weapon. Assess the actual item, protective packing and baggage conditions. This guide does not promise insurance coverage, a theft comparison between cabin and hold, or a particular compensation amount.

Documents, cash and jewellery

Bring original travel or legal documents when the relevant authority requires them. A certified copy or digital scan is not a universal substitute for a passport, visa or other required original. For a document that the trip does not require, decide whether carrying it adds unnecessary loss risk. If you keep backup copies, choose storage appropriate to their sensitivity and access needs.

Cash and jewellery are not automatically security-prohibited, but declaration and import rules depend on the itinerary. No universal 10,000-dollar threshold or obligation to declare every laptop is assumed here. Keep required essentials accessible and plan where they will be if the main cabin bag must be checked. Do not rely on insurance without reading the applicable policy and exclusions.

Before a bag is taken at the gate

Remove spare lithium batteries, power banks and vaping devices where FAA rules apply. Keep required documents and essential medicine accessible. For an installed-battery device accepted in the hold, FAA requires it to be fully off and protected against accidental activation and damage. Confirm a special device or chemical rather than assuming every rejected cabin item is acceptable below.

If security refuses an item, follow instructions and ask what options exist. Return to check-in, postage, storage, later recovery and free handling are not guaranteed. Check reused pockets at home; allow time for the airport's actual process rather than relying on an invented fixed checkpoint delay.

A short packing decision

1. Is the exact item allowed by every applicable checkpoint, carrier and destination rule?
2. Does it fit the booked number, size and combined weight of bags?
3. Do you need it on this trip, and can you protect and retain it through screening and a gate check?
4. If any answer is unknown, confirm it before packing instead of assuming a tiny container, original package or checked bag solves the problem.

For item-specific questions, see scissors and electric shavers, batteries and cleaning fluid.

Official sources and scope

Use the named jurisdiction and product category, not a worldwide permission.

• FAA: spare lithium battery limits and protection
• FAA: devices with installed batteries
• FAA: dangerous goods, toiletries and medical exceptions
• GOV.UK: airport-specific liquid screening rules
• CDC: medicine rules across destinations
• FAA: vaping devices and no onboard charging