Does USPS charge extra to ship a tube?
Yes. USPS's Notice 123 price list, effective July 12, 2026, adds a $4.50 nonstandard surcharge to any cylindrical tube or roll, and it applies whether the shipment moves on Priority Mail Express, Priority Mail or Ground Advantage.
Does USPS give away a free tube the way it does flat-rate boxes?
Not a flat-rate one. USPS's Priority Mail page, read 2026-08-18, lists free flat-rate envelopes and boxes with no tube among them. The Postal Store does list one free tube-shaped carton, the Dual-Use Priority Mail and Priority Mail Express Small Tube Box at 25-9/16 x 6 x 5-1/4 in, a squared box that ships at normal weight-and-zone prices rather than a flat rate.
Is USPS the cheapest way to ship a tube?
Not necessarily. In both tubes we quoted on 2026-08-18, UPS Ground beat USPS Ground Advantage: $12.40 against $15.29 on the shorter tube and $14.78 against $22.16 on the longer one. Price the exact tube before assuming USPS wins on shape alone.
What packaging triggers the surcharge besides a tube?
USPS's own wording, from Notice 123 read 2026-08-18, lists a can or a wooden or metal box, more than 24 ounces of liquid in a glass container, a gallon or more of liquid in metal or plastic, and any parcel whose contents may cause it to roll or break the packaging during processing.