Large ice cubes
Our freezer doesn’t make ice, so I use ice cube trays instead. The ones I have make 2-inch cubes (a little over 4 ounces), which is perfect for keeping cocktails cold for a long time. They’re made from flexible silicone and come with a lid. Some people even use them for baking. Rycore sells the trays as a 2-pack for $21. — MF