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What are some options for attaching bags or large water containers my rear rack here?
None of the hook style panniers will work since the bar is right up against the crate.
I'm thinking maybe some kind of dry bag that can be attached with a strap through tholes in the bottom of the crate so it wraps around the crate and rack.
For water storage, something that can be flexible in shape to hold rectangular 1.5L bottles would be nice