U.S. TSA / DOT Guidance · Updated October 4, 2026
Can You Bring a CPAP Machine on a Plane?
Yes. Pack medical equipment separately. A CPAP is a medical device. Under applicable U.S. DOT rules, a medical-only assistive-device bag is separate from the normal allowance. Keep it in the cabin when it can be safely stowed; a bag mixed with personal items can count toward the limit.
The rules
Carry-on essentials
Move through the airport fast and keep everything in its place from gate to gate.
CPAP machines, water, and batteries: packing rules
| Item | Carry-on | Checked | The rule |
|---|---|---|---|
| CPAP machine | Yes, free | Yes | Assistive device; separate from the normal limit when packed without personal items and safely stowed |
| Mask and hose | Yes | Yes | Part of the device; allowed |
| Distilled water for it | Medical-liquid exception may apply | Yes | Ordinary water follows 3-1-1; declare medically necessary water separately for inspection |
| Spare lithium battery pack | Yes | No | Carry-on only; protect terminals and check watt-hour limits and airline approval requirements |
The official word
Straight from DOT
“Assistive devices do not count to your baggage limit.”
U.S. Department of Transportation, assistive-device guidance; personal items packed in the same bag can affect this exemption
Before the checkpoint
Medical-only baggage, screening, and water
A medical-only assistive-device bag does not count toward the normal baggage allowance. If it also contains personal items, the airline may count the bag and charge a fee. If the device cannot fit safely in the cabin, DOT requires transport in the hold at no extra charge.
TSA permits the machine, mask and tubing to stay in their carrying case. Standard screening may require taking that case out of your carry-on; follow the officer’s instructions.
Ordinary water is subject to the 3.4 oz / 100 mL container rule. TSA permits reasonable quantities of medically necessary liquids above that limit, declared separately for inspection. Distilled water is not automatically exempt just because it is distilled.
FAQ
CPAP flight and security questions
Can you bring a CPAP machine on a plane?
Does a CPAP count as a carry-on bag?
Do you have to take a CPAP out at security?
Can you bring distilled water for a CPAP?
Sources: TSA: What Can I Bring · DOT: Assistive-device stowage · Screening and device-bag guidance checked October 2026