Bikepacking - a viable alternative to racks & panniers

The bivvy was fine, it's just the same as being in a mummy-style sleeping bag. Stayed dry all night, no rain this time thankfully. I found it warm enough just wearing bibs, tshirt, jersey, socks and a hat all night, it probably didn't drop below 6degrees though, the other guy thought the ground was too cold though and would have preferred a mat or something. Thankfully the ground was pretty comfy, found some springy but not lumpy grass amidst all the heather and bracken.

Think you could keep it up for a week or two?