In the market for a laptop

Good day, I have been using Linux for years, but it's time for a new laptop. I use an old Thinkpad running Arch which has a battery life of around 2-3 hours. It also weighs about 8 lbs. After this last week lugging it around security conferences, I decided I want something lightweight and with good battery life. I'd like something with at least 6 hours of life, under 15 inches, and under 4 lbs. I welcome your suggestions.