Greenco Mini Food Storage Containers, Condiment, and Sauce Containers, Baby Food Storage and Lunch Boxes, Leak-resistant, 2.3 oz Each 20 count

From the product description, check product page for current description, price and availability:

• Value Pack – Set of 20 round “mini Storage Containers” for Dips, Sauces, Dressings, Baby Food and More
• Multiple Usage – Perfect for Lunch Boxes or for Storing Small Craft or Household Items
• Capacity – Each Container Holds 2.3 Fl Oz. (68 Ml). Dimensions: 2.75 X 2.75 X 1.5-inches
• BPA Free – Fridge, Freezer, and Dishwasher Safe, Not for Microwave Use
• Kid-friendly, easy-open lids; leak-resistant

I similar (but different) containers like this storing and organizing small parts and pieces (like smaller o-rings) around my home brewery.  You could also use these for pH and refractometer sample collection and for portioning out boil additions on brew day.

Greenco Mini Food Storage Containers, Condiment, and Sauce Containers, Baby Food Storage and Lunch Boxes, Leak-resistant, 2.3 oz Each 20 count – affiliate link, note that multiple variations of this product may be available, as such a different version may appear at this link


Also: Bulk Keg Orings and Keg Repair Part Numbers

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Make sure the components you use are compatible and rated for your intended application.  Contact manufacturer with questions about suitability or a specific application.  Always read and follow manufacturer directions.