Another Sea to Summit innovation for the camper that takes space-saving and efficiency most seriously. A collapsible set of food containers with airtight seals, the X-Seal & Go large set includes 1 medium-size container and one x-large-size container which nest into each other and collapse to a mere 1-1/8" compact package. The threaded lids are simple and easy to operate; one quarter turn provides instant peace of mind against leaks. Handy measurements printed inside are perfect for culinary adventures on the trail, and you'll want another set for the RV or taking lunch to the job site.