Uneven surface can be an issue when attempting to keep your expensive wine in your glass and not all over the ground. That is why I use these outdoor wine bottle holder and glass holders to keep my wine safe and my hands free. Picnics in the park, a day at the coastline or just in my yard, they are terrific for keeping my glass of wine safe while I take pleasure in other things. No more consuming out of paper cups, I use real wine glasses.