There have been some 'lively' discussions here in the past concerning ultralight vs. all the comforts of home vs. budget. One way or the other, though, every gram you pack on the bike has to be pedaled over that mountain pass.
(Well, or walked.
)
The biggest delta impact on overall weight will be with the heaviest items.
Unless you bring a cast iron Dutch oven, your heaviest item will probably be your tent.
Light tents: Durston, Tarptent, ZPacks & etc.
Yeah, ultralight comes at a cost to durability, I prefer to lean on the hardy side. An extra few pounds can easily translate into longer life and less mishaps.