My bicycle touring base-weight (26lbs) is twice my backpacking base-weight (13lbs). The extra weight is mostly for comfort. The "extras" include:
- Large Tent
- Fleece Pillowcase
- Foam Sit pad
- Water Filter
- Fork, Spoon & Knife
- French Press Mug
- Large 1.5L cook pot
- Canister stove
- Comfy Fleece Layer
- Extra pairs of socks, underwear, and padded shorts
- Stuff Sacks for organization
- Hyper-juice Lithium Battery
My most recent tour was 100% camping for two months. I don't mind dropping down a gear or two, on the drivetrain. The extra time is worth the added comfort. No bicycle-gears when backpacking so I'll keep it more minimal.