It's not necessary, as you could just hem the edges. I'm just a big fan of grosgrain. I think it adds a level of durability to any project. Plus it looks nice. It doesn't weigh all that much, but yes, it will add a few grams to the weight. I just finished my DIY hammock with an integrated bugnet. I used grosgrain on both edges of that too. You can see details of it in the DIY section.
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