>>2218004As for mil-spec; it's basically just covering the tube and bit for sun protection/insulation. Sleeves aren't hard to get for bladders aftermarket, but maybe getting one with it and not having dirt get stuck in the bit often is worth the five shekels
Speaking of shekels; I have a Source bladder, but I don't like how they close the top with a fold and friction. It seems to always leak if the pack is laid down or tilted sideways. The way the tube detaches at both ends is nice, tho. Pic related
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