Everything about these little bags is ideal for me. They are divided into easily managed lots of 100 bags, each in its own zip-lock bag, all five together in a larger zip-lock bag. The 'zippers' close/open easily and hold well. The bags are completely transparent. The 4 mil thickness makes them tougher than many others. That they are available with Amazon Super-saver shipping is a big plus.That each 100 bags are held in their own resealable bag is a definite advantage. This makes the bags easily manageable, especially if only needing to remove a few at a time. It also keeps all the other groups of 100 completely protected (and neat) until needed. Another benefit is that it's pretty easy to quickly estimate how many bags are left at just about any time by seeing how many packs of 100 are unopened.The 2.5" width is not so common but that little half-inch definitely makes it easier to insert and remove any but very small items.Four mils of thickness means that the plastic will hold up much better than any of those 2 mil thick bags that are much more common. That is a great benefit when re-used multiple times as well as when routinely carried around.In some cases, I have found items with Amazon's Super-saver shipping to have a price not really cheaper than the competition's total price. However, with these (and some of the other plastic bags) that is not the case. They are priced very competitively, and that is just magnified when purchasing more than one lot as competitor's shipping prices are multiplied by however many lots are being purchased. This can easily add $5 to $10 to EACH lot. [Buyers must take care to select "Amazon's Super-saver Shipping" during the ordering process or they will fail to take advantage of this option.]