I've had all three. Size would go XS, banana, S. sackville small isn't exactly small, and the shape of it really utilizes space. I used to regularly get 2 takeout boxes in mine without hassle or jostling of the food. The banana is smaller for sure, but the way space is used almost makes it not comparable to the sackville small. It's a really useful bag but more for riding essentials like Lock/jacket/tools and doesn't feel as saddlebaggy. XS is too small for my liking. Couldn't fit much more than a tube and a few tools.
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