Apple iPhones Compatible Brand and running arm pack sport waist bag arm strap with built in phone shoulder holder

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Hello, we are a new establishment interested in your product but we want to make sure that its possible to fuse and combine it with another product, lazy neck Lazy Mobile Phone Holder. We want the two products to be in one piece and the mobile holder installed on your product, and be hidden in the pocket when not in use. Can you design it for us?
Looking forward for your reply and Thanks in advance.