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I have used an Apidura food pouch between the bars and then elastic with a toggle on top to make best use of the space. Works with most things (baguettes, beer etc) and still easy to access the pouch. I really liked the mesh pockets on either side of the Apidura pouch for putting empty wrappers in, keeping the pouch free for actual food and bottles.
Edit - just realised that pic is a decathlon pouch. I ended up with the Apidura in the middle and a decathlon one on each side of the stem, tucked under the pads.
I'd like to knock together some sort of "snack hammock" to make use of the space between my aerobars and to have food within easy reach. Anyone aware of anything like this out there?