Grand Traverse Sleeping Bag?

I'm looking at sleeping bags for a Grand Traverse attempt this summer (most likely at the end of July/Early August). I was looking at the Western Mountaineering Summerlite

westernmountaineering.com/i…

I like the versatility of the full zipper. I will be sleeping in a tent or bivy. I was wondering if anyone had any other recommendations or if this would be a good option? Thanks

Mountain hardware's new hyper lamina in the 32 degree version would be an awesome bag to consider

Thanks.... That was actually the synthetic alternative I was also considering. Cheers