I've got two bags, ones a -7 and served me well in the snow. The others a +10 and cost me $25 about 10 years ago now. Can't complain about that. You just don't need an expensive bag in summer IMO, its just there to keep the breeze/mozzies out.
Life's too short to be grumpy, SMILE
PM me for all your window cleaning, pressure cleaning, and commercial cleaning needs!!Nathan's Window Cleaning