bag := &multistep.BasicStateBag{} bag.Put("myKey", "myValue") val, ok := bag.Get("myKey") if ok { fmt.Println(val) // Output: myValue }In this example, we first create a new `BasicStateBag`. We then use the `Put` method to insert a key/value pair into the bag. Finally, we use the `Get` method to retrieve the value associated with the key. If the key exists, `Get` returns the value and a boolean indicating success; otherwise, it returns `nil` and `false`. The `github.com/mitchellh/multistep` package is a library that provides a collection of utilities for building multi-step tasks in Go. It is not included in the standard library, but is instead available as a third-party package.