There is a bar that slides across the top to open and close them. You can fully get your hand in to clean and dry them. Additionally you can clip and unclip the hose at the bag. Meaning they are very easy to thread through your bag or to fit a thermal sleeve in winter.
Another vote for hydrapak. Prefer the sliding bar to open the pack; which gives an nice wide opening; hose has a quick release which is drip free; can be turned inside out for easy cleaning. The after sales support is very very good too!
Don’t know about the hydrapak ones, I’ve always had camelbak ones. But I’ve noticed that on some of the cheap ones there is nothing stopping the bag from bulging. The Camelbak ones have a strip down the middle that stops the front and back from bulging away from each other
I’ve a ‘Source – Widepac 2’ one I use if I’m riding with a pack (not very often these days) Full width roll-top opening so you can properly empty and clean it and a quick connect type hose fitting so you can detach the hose from the full bladder and not spill a drop…
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