Looked like a floating weather balloon that suddenly developed a vapor trail and flew away after about 30 minutes of observation.

I was in and out of my house over a period of time because I was cooking on an outside smoker. While I was doing so, I noticed a sparkle in the sky. I went to a better vantage point in my yard, due to tree limbs, to be able to see what it was. It was evidently floating in the air and not moving across the sky at any noticeable rate. As it was floating, it would glitter as if when the sun would hit it at just the right angle and make it sparkle. As I was continuing to cook, I continued to watch it and wonder what it was. I came in the house and got my wife to come out and look. She saw it too. We had discussion of “Gee, I wonder what that is?”. Again, it was just floating in the same area of the sky for over 30 minutes and it was almost if the wind was blowing and making something flap and it would continue to catch the glint of the sun and make it sparkle. I was in and out of the house, due to the cooking preparation, and continued to look at it every time I went back outside which is probably 10 times over the span of 30 minutes. The last time that I went outside and saw it, I just happened to be staring at it when suddenly it developed a vapor trail behind it and zoomed off to the northwest of my position. That was the end of the observation.