ROCKBROS Bike Frame Bag Bike Triangle Bag Waterproof Bike Top Tube Bag Cycling Pouch 1.5 L Classified Capacity

Yeah, but I'm not a fan of the bags that fill that part of the frame. I prefer bags that fit in the front of the triangle, near the head tube and along the top tube. Something more like this https://a.co/d/08iaPz9K for a cheap example. I'm not saying you need to go out and buy something new to appear your friends' aesthetics, but it's an option if you want something different.