Tarptent - Triple Rainbow DW

Honestly, it's plenty big for 2 adults. Two 25" mats fit easily and head room by the poles is great. Not that bad on the low sides either. My main problem in the mountains has always been finding a big enough spot to put it. The footprint under the fly is huge for a two-person. Often have to get creative to get a stormworthy pitch. Getting the perfect pitch can be tricky, but getting one that's good enough isn't usually too hard. As far as other options, the tarptent triple rainbow might be worth a look as well. I Believe the double rainbow can accommodate two wide mattresses, but it gets narrow towards the top. I've personally preferred the triple over the big Agnes because it uses more durable fabric. I had a copper spur for two seasons and had to patch the floor multiple times.

In your shoes I'd get a TarpTent Triple Rainbow DW (double wall). $499, weights 48 oz. Compare that to the admittedly great Big Agnes Copperspur UL3, which costs more, weights 68 oz, and has a square foot less floor area. This will fit your bags and each other inside the tent, with vestibule space if you want to keep anything outside. You can deploy the fly in such a way to allow for sky viewing through the mesh in good weather. It is also made of Silpoly which doesn't sag as much as Silnylon when wet. Speaking of wet, keep the Rainbow's inner attached to the fly and pitch it all together if you get caught in the rain. I own BA Copper Spur UL2, UL3, Fly Creek UL2, and Tarptent Double Rainbow DW. If you were cool with your gear outside, I'd recommend the Double Rainbow DW which weights about 42 ozs and saves $90. The BA Copper Spur UL3 is a good one as well, but is heavy by comparison.

Triple rainbow by tarptent. And it feels roomy.

Do you hike with poles? If so, the single-walled Zpacks Hexamid can be set up with your hiking poles and is USD $499. My Zpacks single-walled tents perform poorly in rainy, humid conditions but making this compromise will save you weight. Tarptent makes several double-walled tents for less than USD $500 that perform well, and there are also some excellent Chinese-made Lanshan tents on Aliexpress. My double-walled Tarptent performs much better than my single-walled Zpacks tents when it's set up, but it's also much heavier to carry.

An X-Mid 1 or 2 would be a fine choice as well. Yeah, the Stratospire is a little finicky to pitch until you get the hang of it. (Although I own both an X-Mid 2 Pro and a Stratospire Li, I don't know if the struts help with stability all that much—so I'd say these two are comparable in stormworthiness.) My personal opinion is folks worry about footprint size a bit much. I'm about 70% done with the PCT and footprint size has been an issue for maybe 2-3 nights. Even then, I ran into trouble because I hiked into the night and should have been finding a campsite. With single-walled tents, I really like Tarptent's Rainbow line, but they don't perform as well in rain and wind, in my opinion, as the X-Mid/Stratospire-style design.

I’ve had great experience with the tarptent rainbow series, just as long as the spine is facing into the wind and not the broad side.