After some searching I found a budget version for a tail bag. The Giant Loop and Wolfman bags are the obvious top shelf choices for this, but I wanted to spend about half what the premium bags go for.

The medium size version of the Held Iconic Evo bag fits like a glove on the PM Rack. I haven’t yet tested how much stuff I can fit in the bag, but I will report back once I have.
The bag has two straps with buckles at both ends. I suppose the straps are designed to go under a bikes seat, but work perfectly with racks too. Obviously. The bag is rigid enough to hold it’s shape even when empty (which is something I wanted).

I’m liking your bag choice! The primary reason that I chose to go with a hard sided box on my L was stickers,LOL 😛 Your new bag looks great on there,and looks b\very handy as well 🙂
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I recently uses d a black 30ltr Molle ruck sack of eBay for £10. All the straps come off easily and it has loads of d rings.
https://www.ebay.co.uk/itm/201419513848
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Do you know if it is waterproof?
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Technically no. But as it is semi rigid and has Multiprint layers of fabric with an inner stiffening structure, water hasn’t come through yet. Using a rain cover hasn’t been necessary so far.
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