I purchased those bags on Amazon, can't remember what the price was, but I think around $18. Due note here, I found two different ones on Amazon, both were identical except for the logo on the bag and the price difference was around $10 difference between the two. I would recommend this bag as they are worth the price and the quality is good, plenty of pockets and a caring strap is included. I would type in Orange Bike Tail Bags and see what comes up. This is the other bag, I found it on Amazon for $28, I could not find the one I purchased with the logo on the bag, maybe that was a logo for some company, etc. and they were just clearing them out. https://www.amazon.com/VGEBY1-Lugga...range+bicycle+tail+bags&qid=1584554935&sr=8-7What type of pack are you using on your rack. It looks great. Is it fairly tight and sturdy? Also, we had considered putting bottle mounts on the bike, but thought perhaps they would greatly hinder entrance and exit. Do you find that your lock mount does that? Neat idea I think.