Definitions:

1. A small bag or envelope, often made of paper, plastic, or fabric, used to hold perfume or scented herbs, single-use amounts of shampoo, lotion, or conditioner, or samples of products for promotion or travel. NOUN
   • The hotel provided a sachet of shampoo and conditioner.
2. Refers to a small, sealed bag or packet, typically containing a powder, liquid, fragrance, or sample product. NOUN
   • She tucked a lavender sachet into her dresser drawer to keep the clothes smelling fresh.

Synonyms:

• envelope
• packet
• pouch
• sample pack