Sorry. After surfing around forums reading on how to make everything lighter, and doing months of research that led to buying quilts that each weigh 16 oz with temp ratings of 25F, the phrase "only 3 lbs" in a conversation about sleeping bags sat up and punched me.

3 lbs is a perfectly decent weight for starters. Don't let anyone tell you differently. You will want to be sure that the 30 degree rating is accurate, however, before trusting it on an outing of any length or duration.