I also wouldn't exclude a single walled tent. Hammocks look attractive, but when you include under quilts, straps etc they get heavy and bulky. Bivys can be uncomfortable and many end up as heavy as a tarptent. I use a Tarptent Contrail with a custom pole that has 4 sections so it fits into my saddlebag. Total weight is 1.5lbs and it takes just 5 mins to put up. I pack the tent in a compression sack so that it takes up very little space.