If you need a mallet that has the force of a heavy-duty mallet, but without the extra weight then the Rubber Mallet from Zempire will be right up your street.
This model will drive in your medium weighted pegs and help you to get your tent pitched as quickly as possible, without sitting heavily in the bottom of your pack.
Rubber mallets also have the benefit of being slightly quieter than plastic, so you can pitch your tent quietly after a head-achingly long car trip, without annoying your tired camp buddies.