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diff --git a/chapter6/bag4demo.cxx b/chapter6/bag4demo.cxx
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+// FILE: bag4demo.cxx
+// Demonstration program for the 4th version of the bag
+// (from bag4.h and bag4.template).
+// This is a the same as the demonstration program for bag1,
+// except that we are now using a template class, and we no longer need to
+// check whether the bag reaches its capacity.
+
+#include <iostream>     // Provides cout and cin
+#include <cstdlib>      // Provides EXIT_SUCCESS
+#include "bag4.h"       // Provides the bag<Item> template class
+using namespace std;
+using namespace main_savitch_6A;
+
+// PROTOTYPES for functions used by this demonstration program:
+void get_ages(bag<int>& ages);
+// Postcondition: The user has been prompted to type in the ages of family
+// members. These ages have been read and placed in the ages bag, stopping
+// when the user types a negative number.
+
+void check_ages(bag<int>& ages);
+// Postcondition: The user has been prompted to type in the ages of family
+// members once again. Each age is removed from the ages bag when it is typed,
+// stopping when the bag is empty.
+
+
+int main( )
+{
+    bag<int> ages;
+
+    get_ages(ages);
+    check_ages(ages);
+    cout << "May your family live long and prosper." << endl;
+    return EXIT_SUCCESS;  
+}
+
+
+void get_ages(bag<int>& ages)
+{
+    int user_input; // An age from the user's family
+
+    cout << "Type the ages in your family. ";
+    cout << "Type a negative number when you are done:" << endl;
+    cin >> user_input;
+    while (user_input >= 0)
+    {
+        ages.insert(user_input);
+        cin >> user_input;
+    }
+}
+
+void check_ages(bag<int>& ages)
+{
+    int user_input; // An age from the user's family
+
+    cout << "Type those ages again. Press return after each age:" << endl;
+    while (ages.size( ) > 0)
+    {
+        cin >> user_input;
+        if (ages.erase_one(user_input))
+            cout << "Yes, I've got that age and have removed it." << endl;
+        else
+            cout << "No, that age does not occur!" << endl;
+    }
+}