Lost the bag for my leaf mulcher/vacuum - DIY solution?
I can't help you with a DIY bag, but I'm not sure why getting a replacement bag should be so expensive. I don't know which Toro electric blower/vac/mulcher you have, but I have the Toro model 51599 Ultra Vac ($84 at Amazon). The replacement bag for it (model 51601), which I have ordered myself previously, is about $20 at Amazon. Agreed it's rather expensive for a canvas bag with a zipper and a strap, but (at least for this model) you could buy four for the price of the new blower/vac/mulcher. And it's hard to imagine a pillow case and hose clamp not ripping or coming apart until the intense pressure of 235 MPH/255 CFM air (for the 51599, at any rate). But perhaps the blower and bag you have are a different model and much closer together in price, so YMMV.