I like to bag small amounts of cookies in sandwich sized zipper bags and then. . .
--squeezing the air out as much as I can-- I place however many packed sandwich bags as will fit into a gallon zipper bag and place that gallon bag into another zipper bag (then the cookies are triple bagged) and date/label and stash in the freezer. I use regular gallon zipper bags and *always* double or triple bag. The multiple gallon bags keep things very well, and the sandwich bags allow me to remove only a small amount of cookies for fresh eating, as long as I re-seal the gallon bags!
As plastic is only "moisture resistant" and not moisture PROOF, I find more bags keep things much better and fresher. It is convenient to use this multiple bag method for all sorts of stuff: Dividing and feezing 5 lb sacks of shredded whole-milk mozzarella, 4 lb containers of grated Parmesan, my reduced calorie bread, fresh home-made bread, etc. I have product that I like at a better price and I can always use the gallon zipper bags again.