There are a lot of cool things about their sacs. First, they have a chart where you can look up the compartment into which you'll be putting it and will recommend a size that will fit. Second, each sac has five holes with caps. This is ideal for plumbing the sacs any which way. Finallly, they have an air hose that comes off the top so that you can get them filled with water only without spilling all over the place.
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