What hydration reservoirs sold at REI are compatible with the REI Flash 22 pack. Description says it has an internal sleeve to hold a hydration reservoir (sold separately); includes a port to route the sip tube over either shoulder. Just need to know what fits best. TC

@TimberlineCruiser Thanks for reaching out!

The REI Co-op Flash 22 will fit up to a 3 Liter hydration bladder. Hopefully this helps!

At REI, we believe time outside is fundamental to a life well lived.
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Will all models work? E.g. Camelbak, Hydrapak, Gregory all work equally well?

@KAS Thanks for reaching out!

Yes, all models of water bladder will work with the REI Co-op Flash 22 pack.

Thanks!

At REI, we believe time outside is fundamental to a life well lived.
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