Recommend me a windbreaker

Let me know what your favorites are, looking for a very lightweight windbreaker that can pack up very small and clip to my harness. Thanks!

The OR helium is pretty good. 

I love Patagonia’s Houdini! 

Light, small and works extremely well for what it’s intended for.

Patagonia Houdini is a popular option here.  Light, very wind resistant, packable.  It will get shredded pretty quickly if you actually climb in it and do any kind of OW/chimney/shoulder scum type movement.

I'd also consider a BD Alpine Start Hoody.  It's a few more oz than a Houdini and packs a bit larger on the harness, but it's still quite light and packable.  Its biggest advantage IMO is that it's a light soft shell material and will hold up way better to actually climbing in it.  

Patagonia houdini prob packs down the smallest. Barely water resistant bc it's so thin, but ppl love it. I think the Black Diamond distance is comparable. 

OR Helium may be the most water resistant and packs down a little bigger. 

I've never used it, but I've heard great things about the Rab Vital. It'll pack down pretty small, and even if it doesn't have a DWR coating, it can resist water. You can also spray on Nikwax for DWR

• OR Helium is a full on ultralight rain jacket. If minimal breathability works for you, and you wanted to take a rain jacket anyways, then it is a good option... but the breathability is completely different than what you would expect with a windbreaker.
• Patagonia Houdini is a good go to. Houdini Air is much more breathable, may be nice for trail running or hiking, but it would let too much air through and get cold at belays.
• BD Alpine Start Hoody is more durable than Houdini, more weight, larger pack size, etc... but its great too.

Rab Phantom, ultra ultra light, has held up really well also,

https://rab.equipment/us/phantom-pull-on

Mountain Hardware Kor PreShell hoodie. 

rab borealis mor of a soft shell, wind  shirt than wind shell but still super good 

I second the kor preshell 

I've been using the BD Distance Hoody, pretty sure it's lighter and packs smaller than anything else people have mentioned. The material is quite thin so I've been nervous about shredding it, but mine has held up well the past year and I recommend it if you want something super minimal.

Just got a Kor Preshell as a lighter option to my Alpine Start and have been impressed. Comfortable and breathable fabric, packs smaller and I think blocks a bit more wind. BD is still more durable and breathable, neither great in rain. I run hot and find myself overheating in Houdini style shells, these both work great. Good price on the Kor. 

OR Helium Wind Hoodie. It’s worked great for me this year. 

Have both an Alpine Start and an Arcteryx Squamish.  Both are stretchy, breathable and comfy. 

The BD one is ever-so-slightly heavier weight and more durable.  I've used it a lot over the last ~3 years and it's held up surprisingly well given how light it is.

I would have recommended the arcteryx squeamish but the recent version is a downgrade to the glory of the old version, I barely wear my alpha fl it's so brilliant. My next windshell is going to be a bd alpine start. 

Arcteryx Squamish

This wind jacket weighs 2.5 ounces. The fabric is so thin I'd hesitate to climb any chimneys, but if you just want a super light emergency wind breaker, it's amazing. I've only worn it a dozen times...but it does the job. It packs very small and would fit in a chalkbag pocket

https://montbelloutdoor.com.au/products/us-tachyon-parka

I’ve worn my tachyon a tonne - from Denali to my regular trail runs. It’s great. Wouldn’t be grovelling up chimneys with it! But for low contact things like running and skiing it’s great. 

Another vote for houdini. I used to have the pants too and DWR'd them for rain pants when backpacking (afternoon storms in the summer) and they were great. I have the jacket now and it lives in my climbing pack and is small enough for me to clip it to my harness or whatever. 

I have the Kor pre-shell and I love that thing. 

I’m team Squamish as well. But the Helium and Houdini both felt pretty similar to me. The Squamish has proven to be pretty robust.  I feel like I’m surprised on  weekly basis that I didn’t put a hole in it.