I've tried o.b. in a different size before and had no issues, but with this one I found there should be an applicator with it. It's ultra so yeah it's gonna be bigger. A bit difficult to insert, but everything else is good with this product, it does what it's supposed to.

not a fan at all, there no applicator and tricky to use

I really hated this product. They are a good price, but that is the only good thing about them. They have no applicator so they are very messy to apply. I find I could never get it applied just right.

I do not care for these........no applicator....enough said.....yuck!

Decided to give these another try after not using them for so many years. Now I remember why I disliked them so much. Messy, uncomfortable and highly impractical. They are not easy to get in and once you get it in the string is too long. I wouldn't want to attempt inserting these anywhere but home. As far as leak protection goes I'm not sure, I'll update with that info shortly...