A few options I have used:
Luna Cycle sells a cheap cordura bag that is well-durable. In particular the zippers survive over the long term. I have only used the velcro version. there is a separate zip tie version with no straps. A black Sharpie over the embroidered logo will dial down the advertising volume. $35
Builders and suppliers of high performance electric dirt bikes, pedal ebikes, and battery kits.
lunacycle.com
View attachment 94011
Bigger than the Luna bag, the Falcon EV triangle bag is an old-school battery bag that has been around for many years. Its super durable and large. So large I have only been able to use it on my larger frames (my bike frame size tends to be L or XL). Quality is very high throughout. Once again a Sharpie will turn down the volume on the logo. $60
www.falconev.com
View attachment 94008
All of my triangle bags have gone over to this vendor: Uraltour. This is just a guy deep in the middle of Russia who will sew you a bag using thick cordura and tough zippers - precisely to your specifications, including spacing out the velcro straps so they miss your frame bosses and whatnot. For a whole $30 plus postal costs. I have four of them now with the first being over two years old. Being in Russia and shipping via the Russian postal service, its going to take 2-3 months to get to you. But if you can wait, the value for the dollar/ruble is absolutely unbeatable.
Find many great new & used options and get the best deals for Uraltour Custom Frame Bag pack+track at the best online prices at eBay! Free shipping for many products!
ebay.us
View attachment 94010