Sachet/sæˈʃeɪ/ Definition 1 of 2Pro Tip 1/3Single-Use Convenience Sachets are designed for one-time use, often provided in travel-size or as samples. At the hotel, I found a sachet of conditioner. Pro Tip 2/3Portion Control Sachets contain measured amounts of a product, helpful for controlling usage. I use one sachet of coffee per cup to maintain consistency. Pro Tip 3/3Ease of Opening Sachets are usually easy to open, designed for immediate use without tools. Tear here to open the sachet of sauce.