Hydro Flask Lids & Caps – Replacement Fit Guide & Prices

Fit & Value

Which Hydro Flask Lid Fits My Bottle?

Hydro Flask lids are interchangeable within bottle families: Wide Mouth threading fits Flex Cap, Flex Straw Cap and Flex Chug lids across 12 oz–64 oz Wide Mouth bottles; Standard Mouth takes Standard caps. The Flex Straw Cap ships with cut-to-fit straws sized for 12 oz, 16 oz, 24 oz and larger bottles, and is leakproof when closed but not for hot or carbonated drinks. The Flex Sip lid is the better choice for coffee because it seals closed and opens with a press. Choosing the right cap first prevents costly returns, and at $4.95–$19.98 these are the cheapest upgrades in the Hydro Flask lineup.