When looking for good OEM duffel bag maker, you want find one that give high-quality bags at fair price. OEM maker produces products for other brands. So if you starting your own brand, you can work with company like Tianqin Bags to create your unique style. Important to choose maker that uses strong materials. Dont want bag that rips easy. Also, check they have good stitching. This mean seams are tight and not falling apart. Reliable maker should has variety of designs too. You might need differnt sizes or colors for customers. Plus, think about production time. Good one will make your bags quick without sacriface quality. Lastly, comunication is key. You want maker who listen to your ideas and gives feedback. That way, you works together for best duffel bags.