Fantastic side saddle bag for your stroller. Thermal lined so you can keep snacks fresh or just keep the diaper cream from melting on hot days. Easily straps onto side of stroller and can come off quick if you are loading stroller into a car often. Will even be able to keep on some models of strollers when the stroller is folded. Orangzing pockets inside of main compartment and alone exterior mesh side pocket. Has luggage straps for suitcase when traveling. About 17 inches at opening. Loved this bag. Sadly kids have out grown strollers.