The search results indicate that "Shower Bottle JM77" is not a widely recognized, globally branded product with consistent information. Instead, the term JM77 appears to be:

A specific product code or model number: One snippet mentions "JM77 CLASSIC" in a list of special offers, suggesting it might be a model code for a general consumer product like a thermos, or a similar item offered by an Asian e-commerce or wholesale site.

Part of a Miniature/Hobby Catalog: Another result shows "JM77 Handley House Miniatures", suggesting it could be a product code for a miniature accessory (like a miniature dollhouse bottle).

An item in a local or regional online market: The term "Shower Bottle" by itself often refers to simple plastic water spray bottles (like a squirt bottle or a portable bidet/cleaning bottle) or refillable pump dispnser bottles for shampoo and body wash, especially in local online markets.