After opening a package of French's Potato Sticks, they typically maintain their best quality for about two to three weeks if stored properly. To ensure maximum freshness, it is advisable to keep them in a cool, dry place away from direct sunlight. Additionally, sealing the package tightly after each use can help preserve their crispiness and flavor. While they may remain safe to consume beyond this period, the texture and taste could decline. It is always a good idea to check for any signs of staleness or off odors before enjoying them. For specific storage recommendations or details, one might consider visiting the current web page associated with French's Potato Sticks, where further information can often be found.