android passing hashmap using parcelable advice

Question

I have an activity that has a hashmap of 15 items. I want to pass it to another activity that uses those items. I am aware that using the Parcelable class is more efficient than serialising. However I wonder if there is any point or much value in creating an object to do the "parceling" and using intent.putExtra to pass it to the activity that requires it. It seems a little long and unnecessary or round about way of doing something - but I don't want the activity to implement parcelable because it isn't good for the design of the application (in my opinion) any advice or opinions on this way of doing it would be very much appreciated.