Wanted to get some opinions on this.
I would like to add a very light, super low volume down vest to my running kit. Primary use would be for breaks used in combination with a wind or rain shell.
I am currently considering 3 options, but open to more.
1.) Montbell Ex Light vest. Probably the lightest option, but discontinued – so hard to come by. Also might be a little light on the insulation. Will it be the most compressible (smallest packed size) though? Backed by Montbell, a well established mfgr.
2.) Black Rock Down vest. Looks like an improved version of the Montbell with more down. More expensive though, but easier to come by now (if im patient) that the MB is no longer made. Is it as compressible as the MB? Additional weight is insignificant, especially since it appears to be all down weight, so presumably marginally warmer.
3.) I have talked with Ben of Goosefeet about constructing a similar vest. Would have the option of 7D or M50 fabric (any suggestions about which is better for this application?). He has also given me the option of square baffles or horizontal tube style (any preferences out there?). And additionally we have spoken about potentially doing a 1/2 zip style as opposed to a full zip. So this route gives me a lot of options to choose from, but at the risk of not knowing what the final product will come out like until it's finished.
This piece would also be used to supplement other insulation pieces for backpacking, but it's primary function will be to live in a running pack or pocket.
Would love to hear anyone's thoughts about this piece. Also I am aware that WM makes a competitive vest of this nature but I'm not a fan of the no-collar design.

