We actually tested out a Speedpack on a slice (but it was just in a bike shop, not out on a ride) and it looked like it fit pretty well. But in any case, you could get one, test it out for fit on your own slice, and you don't like the fit, send the pack back for a refund. No problems at all with you doing that if you send it back in new condition.
Advanced Aero TopTube Storage for Road, Gravel, & Tri...ZeroSlip & Direct-mount, made in the USA.
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