Paul's Shortlist for an Ultralight Backpack

With Paul's shortlist, you will be well on your way to an ultralight backpack!
Ultralight backpacking gear is typically made by small startups; and new products are coming out all the time.
This list shows the biggest weight savings first.

Focus on the Big Three to remove pounds from your backpack! Then focus on ounces for each piece of gear:
Sleeping Bag30 degree down15.4 ouncesZpacks.com
ShelterHexamid Solo11.6 ouncesZpacks.com
BackpackArc Blast16.4 ouncesZpacks.com
Total of Big Three 2 pounds, 11.4 ounces 
    
---More Weight Savings---   
Puffy parkaUL down parka9.8 ouncesMontBell.com
Rain parkaCuben fiber parka5.8 ouncesZpacks.com
Rain pantsCuben fiber pants2.9 ouncesZpacks.com
Wind shirtHoudini4.2 ouncesPatagonia.com
Ground sheetCuben fiber: SoloPlus3.8 ouncesZpacks.com
No rodent Food BagCuben fiber0.8 ouncesZpacks.com
Rain cover for packCuben fiber1.2 ouncesZpacks.com
Water bottles1 liter collapsible0.9 ouncesCascadedesigns.com/platypus
Trekking poles2 graphite LT-48.2 ouncesGossamergear.com
Total Pack Weight so far 5 pounds, 1 ounce 

Choosing your sleeping pad may be next. It can range from an inflatable air-mattress to maybe a thin foam pad for your torso. I like my sleep and use an inflatable NeoAir.

Have fun!