I was bored, so decided to dig into my data for weights.
3F Lanshan 1 tent, (bought on Ebay, shipped from Asia) plus a sheet of plastic for ground sheet, plus a tent pole that was not included with tent, 1325 grams. Includes sack, stakes, extra stakes. It is a trekking pole style tent, no pole included but I cut a pole for the tent instead of using my trekking pole. Tent, no trees required.
REI Sub Kilo Long sleeping bag (over a decade old) rated for 20 degrees (F) - 860 grams
REI Flash air mattress (older version, green) - 505 grams.
Compression sack for sleeping bag, Granite Gear Event 13 liter, 80 grams.
No pillow. Use other clothing instead.
Total 2.77kg. Or, 6.11 pounds.
I can trim that weight a bit if I instead bring my Neo-Air air mattress at 375 grams instead of the Flash.
Photo from a backpacking (not bikepacking) trip last summer.
ADDENDUM: Topic was sleeping gear. A gal I used to work with insisted on a sleeping bag liner to keep your sleeping bag cleaner after days of camping without showers. I have been following that advice for over a decade. I have a couple of them, the lightest one is Cocoon Silk at 120 grams or roughly 4 oz. And I almost always sleep with a thin stocking cap on when camping, add an ounce or two.