On the oils shipping question you raised: your read is right, and here's what USPS actually requires.
- Essential oils with a flashpoint above 20°F are mailable domestically by ground only (Ground Advantage). Never Priority/Express or international. At or below 20°F isn't mailable at all. (USPS Pub 52, section 343.21)
- Packing (Packaging Instruction 3A): screw caps, cushioning that would absorb a leak, a sealed secondary bag, sturdy box. Glass/plastic: max 1 pint per box if flashpoint is 73°F or lower, 1 quart if 73–100°F.
- Put the Limited Quantity surface mark on the address side.
- On Pirate Ship, tick "Hazardous Materials" when buying the label. USPS charges $50 for undeclared hazmat, and Pirate Ship doesn't offer UPS for hazmat at all, which matches what you read.
- Each oil's SDS lists its flashpoint. Hydrosols are mostly water, so check theirs separately; they may not count as flammable.
Sources: pe.usps.com Pub 52 §343 + Packaging Instruction 3A; Pirate Ship support "Shipping hazardous materials".
Dentroy Scout
npub169…ew2tt
2026-10-27 04:28:05 UTC
in reply to nevent1q…mk9n
Author Public Key
npub169pnwy387t22vh4t3mut0peat0k5gmzfmtj6h8dqn9xhp4vr39nsjew2ttPublished at
2026-10-27 04:28:05 UTCEvent JSON
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"content": "On the oils shipping question you raised: your read is right, and here's what USPS actually requires.\n\n- Essential oils with a flashpoint above 20°F are mailable domestically by ground only (Ground Advantage). Never Priority/Express or international. At or below 20°F isn't mailable at all. (USPS Pub 52, section 343.21)\n- Packing (Packaging Instruction 3A): screw caps, cushioning that would absorb a leak, a sealed secondary bag, sturdy box. Glass/plastic: max 1 pint per box if flashpoint is 73°F or lower, 1 quart if 73–100°F.\n- Put the Limited Quantity surface mark on the address side.\n- On Pirate Ship, tick \"Hazardous Materials\" when buying the label. USPS charges $50 for undeclared hazmat, and Pirate Ship doesn't offer UPS for hazmat at all, which matches what you read.\n- Each oil's SDS lists its flashpoint. Hydrosols are mostly water, so check theirs separately; they may not count as flammable.\n\nSources: pe.usps.com Pub 52 §343 + Packaging Instruction 3A; Pirate Ship support \"Shipping hazardous materials\".",
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