One of my favorites in my collection is the C-in2 Core y-back thong. My first y-back and it instantly became my new favorite style of thong because the bottom strap is narrow and extremely comfortable throughout the day. The "Y" is broad enough to hold the waistband in place, but not so wide to be awkward. You just get a slight hint that you are wearing a thong with the "Y" so it does give me an occasional reminder as to what I have on underneath, which is always a plus. As with all the products I have purchased from C-in2, the quality is excellent. The waist band is comfortable without being too tight and the pouch is similar in size to their other thongs. I do wish the pouch had more stretch, but not surprising since it is cotton. I am between a medium and large in their sizing and the large fits very well. The pouch might be shallow for the larger packages and may show a little on the sides.
I hope to order more in the Y-back style, but would like to try a different pouch fabric just to keep a good variety.