I was asked about the durability of knitted blankets and whether I felt they were too heavy. I prefaced my reply with a short story.
While I was still living at home, our neighbour was crocheting all the time. She made all the blankets for her family. We could view the lovely rainbow of colours on wash days when there would be many of these blankets hanging on the line. Not that they were washed every week, but frequently there would be half a dozen or more on the line. We were neighbours for several years and during that time there were many washing days. When asked, the neighbour told my mom that her family liked them better than regular blankets.
did they get balls from the frequent washing? I have no idea, but that wouldn't stop them from being warm. I have knit and crocheted at least a dozen blankets/afghans over the years and most of them still look good. The dog's blanket is filled with hair, but he loved that he could stick his head under it and still breath (we could tell this by his actions).
As or the blanket being heavy, I am planning to use 12 100 gram balls. That is about 2.5 pounds. I consider this the weight of two thin blankets and much cuddlier. Not heavy at all.
Basically it comes down to personal preference. I haven't knit one with wool as there is the expense and the washing issue. You could use super wash wool, but that is even more expensive. I wouldn't use the cheapest of yarns as they might be more prone to balling. Use a yarn that you are familiar with. If you have used it in a sweater and are happy with the way it washed, then go ahead, pick and pattern and start making your own blanket.
Next week I'll show you photos of some of the blankets I've knit and/or crocheted. Would you like to share the blanket you've stitched, send me an email with the jpeg attached and I'd be happy to include it.