I, personally, don't think there's anything wrong with keeping your herbs in re-sealable bags.
But, I enjoy finding unique colored jars to keep my herbs in.
Red ones, for herbs that i use for love, and Green ones for money or Old Purple ones for calming herbs. They're fun to collect and pretty :).
If you want to buy jars online, my only suggestion would be to make sure they have a fairly large opening to make it easy to get the herbs out.