Hey, Just out of curiosity, has anyone tried any of the solar hydration backpacks? Like an ECEEN (http://www.amazon.com/Backpack-Charging-Smartphones-10000mAh-Waterproof…) or Lumos backpack (www.amazon.com/gp/product/B00VWIV40O)? They are usually larger (can carry 3L), but useful for slightly longer journeys. On that note, do you guys use hydration backpacks just for mountain biking or do you use them on smaller tours (Sub-200kms) as well? Thanks...