This PL251 for smaller tubas fits the Jupiter JCB-582 (JTU-1110) like a glove. Literally the perfect fit.The case itself is great quality, with heavy duty zippers, rings and clasps. There are handles on three sides of the case which make it easy to move around. The backpack straps are solid, comfortable to wear when loaded, and tuck away when you don’t need them. It’s easy to load the tuba in and out as the case opens completely. Good sized pockets, with internal storage for smaller bits like your mouthpiece, valve oil, pencils, ect.Highly recommend this case, especially if you have the Jupiter horn or something similar in size (Miraphone 186 perhaps??)