When I decided to no longer use a sleeping bag and to only use a sleeping quilt I was at the time of purchase surprised as to how my quilt could be crushed to a small size. I use a stuffsack to hold it in place and this works very well. My quilt is fine for reasonable weather and I've learned that to keep warm and comfy in colder months I use a good inflatable mattress (Thermarest NeoAir in my case plus a fitted sheet) then a baselayer top and leggings, then if really necessary I just put on my warm daytime jacket. Utilising day wear into nightwear also saves a fair bit of weight as well.
The combination of mattress, sheet, baselayer and leggings, warm jacket work, the layering works in harmony together. For me, the key to it all working properly though as it gets colder is the mattress, without it, every combination of layers then fails.