The Montbell U.L. Down Parka seems to be a perfect addition if you are planning to use a quilt instead of a sleeping bag during spring, summer, and autumn. The down parka is super light and has an 800 fill. It also features a DWR treatment, YKK zippers, and an adjustable hood. This is my current down jacket on my hiking, backpacking, and other backcountry trips and here comes a short review.
The Montbell UL Down Parka weights 260 grams and comes with 800 cuin goose down. It also has a DWR treatment and comes in a 15-denier ballistic airlight nylon shell to keep the down dry if it’s very moisture however this jacket is not waterproof.
The Montbell U.L. Down Parka is great for anything where you are not active to keep you warm during 3-season (e.g. sitting in the camp in the evenings). There are also plenty of down jackets available which have even better down quality. I also wear it as an extra layer if my sleeping bag is not sufficient or as a mid-layer during the winter.
If you need a real winter down jacket then the Rab Positron Jacket would currently be my favorite winter down jacket.
Still not sure which down jacket to buy? Here is a list of my favorite down jackets which I would currently buy as a 3- and 4-season down jacket.