Is anyone using a hydration reservoir with their Malaga? I'm playing with the idea of getting one for short hikes and I've noticed there are two types of them (sort-of): the "long narrow" ones (e.g., Camelbak Omega 50oz), and the "stubby wide" ones (e.g., Camelbak Antidote 50oz). Could some kind soul please verify which of the two is a better fit for the Malaga?