First off - just got this and put it on. I am quite pleased with the product but, admittedly, I can't speak to how long it'll last having only owned it about 2 weeks. So my review is graded on a curve considering it was one of the cheaper bimini covers. So for $43 or something like that I'm quite pleased.The storage boot seems to be decent quality, decent zipper, includes a decent storage sack, and it fit my rolled-up bimini just fine, loose enough I won't have to struggle to roll the top super tightly every time I pack it up....but probably not loose enough that it'll flap too much while trailering the boat.I have a 18-foot North River welded aluminum boat with a 5-piece window. It's the popular Pacific NW fishing boat style, to give an image of what kind of top I'm rolling up in this thing. My bimini is a 3 bow design, I believe 1-inch diameter poles....to give an idea of capacity.I measured the widest width of my top as well as the width of the support poles on my gunwales....basically the same measurement (88") and ordered the model that fit 85-90". The fit was pretty generous. I bet the next size down could fit if you're really concerned about a trim fit.