An assortment of glass bowls, including Pyrex custard cups or dessert dishes, is ideal both for microwaving and storing. Glass bowls are microwavable, nonreactive, and don’t retain odors. When calling for general sizes of bowls in the recipes, I use the following guidelines: A small bowl is about 4 cups (1 quart) capacity. A medium bowl is about 6 cups (1½ quarts) capacity. A large bowl is about 8 quarts capacity.
For melting chocolate, Rose’s Silicone Baking Bowl, from Harold Import Co. (on Amazon), is perfect because it can be used both as a double boiler over a pan of hot water and in the microwave. It collapses into a flat disk for convenient storage.