This is one of my favorite Ziploc bags to use. The slider makes it simple to close the bag and know that it is closed. With many other storage bags, I have to manually press in the seal and do that across the whole bag. Apart from the manually sealing, another problem I have with these other kinds of bags is that they can be easily and unintentionally left open. Many times after I have sealed them, I come back only to find that it was not sealed after all; it only looked that way. This has happened repeatedly to me when using these bags but almost never when using this slider bag with smart zip. This is because I can easily tell when the bag is open. If the slider is on the left or middle, its open, if its own the right its closed. The smart zip sealer is designed for comfort; it is slightly indented and large enough for the fingers to grasp. It slides very fast , but sometimes therein lies a problem. I tend to "over zip" the bag frequently and the smart zip comes completely off. However, its not hard to put the zip back on, just come from above and squeeze it back on. If Ziploc could fix this overzipping problem I'd give this product a 10.