I’ve been doing different kinds of felting for several years now, and people sometimes ask how I know how big to knit something when I want it to be a specific size after it’s felted. The simple answer: it depends. You have to know your wool. Some yarns, like Paton’s merino, shrinks for me by about 1/3, so I always knit things made with that yarn about 1/3 larger. Other yarns, like those specially designed for felting, I’ve found shrink far more, at least by half and sometimes more. The only way to relative certainty is to knit a swatch, measure it, felt it, then measure it again and calculate the difference. I know this is heresy in the eyes of some felters, but I’ve been known to spin wet knits in the dryer set on medium, let it tumble for about 2 minutes, take it out and check the size, and repeat as necessary. Works for me.
This bag was knitted with Lion Brand Monet yarn, which unfortunately has been discontinued.