If you live in a warmer client then the Advanced Bivy from Outdoor Research is the perfect tent/sleeping bag for you.
Eliminate the bulk of carrying both a tent and sleeping bag and get everything you need in one package. The Advanced Bivy also boasts top notch protection against insects and a GORE-TEX® Respiration Positive™ fabric which allows warm air to escape, avoiding condensation while providing weather protection. On hot nights, unzip the vent at the bottom to improve airflow.