There is some good advice here, and a number of options you might consider. For my part I’d like to throw two alternatives into the mix. My recommendations are based on personal experience but like everything in life, personal preferences are exactly that.
For winter trips, I use a Crux Strike. An expensive offering from a British company but worth every penny (in my opinion but I use it a lot). It’s sold as a two-person tent but while it’s a little bigger, it’s lighter and packs smaller than my old one-person Vango. It is a single skin tent so very easy to put up in bad weather (only 3 simple poles and four pegs) but the material is ‘clever’ in that there is very, very little condensation. I love it.
In summer, the Alpkit Elan might be the answer. It’s is a bivvy bag from another British company with two hoops to keep the bag off your face (and midges away) but has a side entry zip that makes it easy to get in and out of. Probably not as robust as my tent but very light and much cheaper, I like this a lot too.