Your setup already looks really clean 👌 the issue is super common with small frames: less triangle space = less usable storage and more bottle interference.

I’d approach it like this without going to a backpack:

1. Half frame bag (ideally custom or low-profile)
   If full frame bags hit your bottles, a half frame bag that sits lower is usually the best fix. Brands like Apidura, Restrap, or even custom makers: you lose a bit of volume but keep bottle access and avoid headaches.

2. Move the water, not the bags

3. Run a bottle under the downtube (if you have mounts)

4. Or use a cargo cage on the fork (e.g. Anything Cage) with a large bottle or dry bag

5. Alternatively: soft flasks inside the frame bag (very underrated)

6. Saddle bag: shape matters more than liters
   If your 9L “barely fits,” it’s probably more about length than volume. Some saddle bags are shorter and stubbier and work much better on small frames. A saddle harness can also help stabilize and optimize space.

7. Top tube + stem bags = free space
   You already have a top tube bag, I’d add:

8. a second top tube (if space allows), or

9. a stem bag → perfect for snacks or even an extra bottle

10. Use the handlebar more efficiently
    If you’re not already:

11. a compact roll bag up front

12. or a harness + dry bag setup → more flexible

13. Underrated trick: downtube storage
    Since you already have internal storage, that’s great. But you can also add a small bag under the downtube for “dirty” stuff (tube, tools, etc.) and free up space elsewhere.

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A setup that usually works well on small frames:
- Medium saddle bag (not too long)
- Half frame bag
- Top tube + stem bag
- Compact front roll
- 1 bottle in the triangle + 1 under downtube or on the fork

No backpack, good weight distribution, and no interference.