Lens to pair with RP for travel

[Fast Glass]

It also depends on how much effort you want to put into your shots. If you are putting a lot of effort into it and going to locations for amazing pics and spending time and effort planing and waiting for the perfect light ect. It might be worth while extending your kit weight a few oz's if it makes a big difference. You don't always have to take your whole kit to every location nessarily.

A wide angle and a 24-105mm like say a Rokinon 14mm f/2.8 and 24-105mm is really not that heavy. If you want a long end that is light weight and decent quality the 70-300mm DO would be once such alternative. The other way to think about it is to leave a lens in the car you know for sure probably won't be useful. So let's say you are going to a place with sweeping vistas. You probably get away with a 14 prime or just a 24-105mm. Or if you are going to a zoo. You might just want the 70-300mm DO or 70-200mm of some flavor.

Just because you have three lenses, you don't always have to take it with you. Many times I take only 1 or 2 lenses if I know exactly what I want to do.

Just my 2 cents. But do not set arbitrary number goals. The way I would look at it is keep them as guide lines, try and shoot for that. But don't get worked up over a few oz's difference if it makes a big difference for you. And of course I'm assuming you will try out your kit before your trip to see if it fits your goals.

But the heavier kit is just my preference. You absolutely don't have to go that heavy and have a more than capable setup.

Again as always, this is just my two cents. I'm sure you will make the right choice in the end for your goals and preferences.

To put it into context, I'd hike around my old Minolta MD 600mm f/6.3 (For 12 years) which was similar weight and longer than the 300mm f/2.8 IS I have now. I had a 1Ds III mounted on my 300 and a 1D III in the other hand and just took it to the park for some birding and walked probably 2 miles. I take breaks and set it down once in a while. But it's not horrible and considered a lightweight alternative with extenders to the awesome 500mm or 600mm options. With some breaks and planning even a very heavy combo is definitely doable. That whole combo while not light, is 186 oz's in the hand. And I didn't get a sore wrist or arm afterwards.

As you know, many birders use a 500mm f/4 and that's much heavier than a 300mm f/2.8 and other still use the 400mm f/2.8 IS or 600mm f/4 IS, first gen. Now those are heavy weights especially with a 1-series and a tripod and anything else you might pack along!

I think your weight goals are very very light and don't worry about going over it a bit.