Of the two products you posted in your question, I'd pick the SmrT Hydration Cargo. Given the temps in S.Cal. you might add a second water rack for a full size water bottle. We did that in Europe - one for wine and the second for water - and it didn't interfere with the ride at all, aside from the fact we dehydrated on wine as much as we hydrated with the water! I think the piggy looks less secure. Good riding!