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Does anyone know which HydraPak flask is compatible with the Black Diamond Distance 15?

I won this pack in a drawing and have been looking for the 500ml BD Soft Flasks, but they've been sold out for the last year or so. It seems like BD's website has them for sale now, but I can't add any to my cart. I tried my Salomon 500ml flasks, but they are too tall for the vest pockets. I think one of HyrdaPak's flasks with a straw may be ideal since the flask pocket sits pretty low.

Any advice would be appreciated.

Not sure about the BD Distance 15, but the BD Distance 8 works with HydraPak 600ml soft flasks (same as Katadyn BeFree 20 oz flasks). From the pictures on BD's website it looks like the chest-strap pockets on the Distance 15 and Distance 8 are identical.

Excellent. I’ll have to give that a shot. Looks like the 8 and 15 can hold the same size flask. Thanks for pointing me towards a resolution.