Flat Cap - 63mm

Name: Flat Cap - 63mm
Brand: HydraPak
SKU: WHP-P005
Price: 3.2 USD
Availability: InStock
Rating: 4.8 (5 reviews)

$3.2 $5 In stock

Category: Replacement Parts

This cap fits all HydraPak products with a 63mm opening including the Stash 1L bottle and Expedition water storage container.

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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.8 / 5 · 5 reviews)

Claire ★★★★★ Oct 19, 2026

I was worried it might not seal well, but this cap threads on smoothly and creates a tight, leak-proof closure. Works exactly as needed for my hydration setup.

Grace ★★★★★ Oct 14, 2026

Lost the original cap to my Stash 1L somewhere on a hike and figured I'd have to retire the bottle. This replacement screwed on with a solid seal on the first try, no leaks rolling around in my pack. Cheap fix for a bottle I wasn't ready to give up.

Abigail N. ★★★★★ Oct 13, 2026

Wasn't sure a $6 cap would feel this solid, but the 63mm threading screws on tight with zero leaks. Now my old 1L bottle is back in my hiking pack instead of the trash.