Hubby & I took a break today, headed up to the mountains for a picnic. At about 8,000 ft. the poor bottle in my REO just couldn't take it any more. The pressure was just to much and juice came up the tube filled the drip cup and ran down the side of the mod. Took me a minute to figure out what had happened to fill my hand with juice. Unscrewed the bottle to let the pressure off and it was good to go again. I guess going from 2,000 ft to 8,000 ft was just to much. LOL! So if your drastically changing altitude don't forget to loosen the cap on your juice. On the way up & on the way down. 8p