This letter explains to the USPS that your sample, in our kit, meets all postal regulations.

• Our free test kit contains all the packaging you need.
• Take a picture of the tracking number so you can see when it gets here.
• Not using our kit? The sample should be:
  • In a bottle with a secure, screw-on lid
  • In a ziplock/recloseable bag
  • Surrounded by absorbent material
  • Addressed to: 
    Blackstone Laboratories
    416 E Pettit Ave
    Fort Wayne, IN 46806

• Because the U.S. considers oil safe to mail, most countries will allow oil to be sent out.
• We will send kits (for free!) to any country. You pay for return postage.
• Our kit weighs at most 170 grams when full.
• We recommend putting the sample into a padded envelope to send it. A box is fine too, but adds more weight.
• Take a picture of your tracking number so you can see when it arrives.
• Guidelines for the top countries sending us samples:
  • Australia: https://auspost.com.au/sending/send-overseas/customs-forms-regulations
  • Belgium: https://www.bpost.be/en/send-parcel/international
  • Canada: https://www.canadapost-postescanada.ca/cpc/en/personal/sending/parcels/compare-services-international.page
  • Denmark: https://www.postnord.dk/en/sending/parcel-services-for-individuals/postpakke-international
  • France: https://www.laposte.fr/envoyer/envoyer-colis-international
  • Germany: https://www.dhl.de/de/privatkunden/pakete-versenden/weltweit-versenden/paeckchen.html
  • Hong Kong: https://www.hongkongpost.hk/en/sending_mail/international/index.html
  • Netherlands: https://jouw.postnl.nl/#!/versturen/details
  • Norway: https://www.posten.no/en/sending/sending-abroad/send-packages-overseas
  • Poland: https://www.poczta-polska.pl/paczki-i-listy/przesylki-zagraniczne/paczki/paczka-pocztowa/
  • Sweden: https://www.postnord.se/en/sending/parcels/international-parcel
  • Switzerland: https://www.post.ch/en/sending-parcels/franking/international
  • United Kingdom: https://send.royalmail.com/