I have always preferred bags with this type of zipper but now, because of serious issues with both thumbs, I find it difficult to use the ones without the sliders. Lately the ziploc brand sliders have become worthless. The slider doesn't work and it's often impossible to open the bag even by trying to pull it apart. I'm always in a hurry when purchasing at a warehouse store and continue to buy. I have put a permanent note on my shopping list on my phone DO NOT BUY ZIPLOC! Too bad because there was a time when they were great.