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42mm Plug-N-Play Cap

4.625 out of 5 stars
24 Reviews

Out of Stock

Don't worry though, we have a lot more Hydration Packs in stock than that.

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42mm Plug-N-Play Cap

Quickly connect a drink tube to your HydraPak Seeker or HydraPak water bottle for versatile backcountry use with the Plug-N-Play cap. Use inside your pack like a hydration reservoir, strap outside like a bottle, or quickly setup a gravity feed at camp.

POM, stainless steel
Hydrapack Stash 750ml, Hydrapak Seekers
Claimed Weight
hiking, camping, backpacking
Manufacturer Warranty
limited lifetime

Overall Rating

4.5 based on 24 ratings

Review Summary

1 Stars - 1 reviews
2 Stars - 1 reviews
3 Stars - 0 reviews
4 Stars - 2 reviews
5 Stars - 20 reviews

What do you think about this product?


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1 out of 5 stars

May 28, 2024

Doesn’t fit many 42mm tops

Fits the seeker 42mm but does NOT fit a ultraflask or a katadyn befree. They bottom out before sealing and water can squeeze through the threads.


Originally reviewed on HyrdraPak LLC

5 out of 5 stars

March 14, 2024

Worked Exactly as I Needed

Exactly what I needed to connect my Hydrapak gear to my Sawyers gear. Like Forest says, everything fits together like peas n carrots!

Dave 2726

Originally reviewed on HyrdraPak LLC

5 out of 5 stars

August 12, 2023

Add to Seeker for perfect water filtration system

Perfect combo with Seeker, 28mm filter adapter, and Sawyer Squeeze water filter.

Michael H

Originally reviewed on HyrdraPak LLC

5 out of 5 stars

August 6, 2023

Quick Field Connection

I use this to make my bladder quickly connect to my Sawyer Squeeze.

Bill D

Originally reviewed on HyrdraPak LLC

5 out of 5 stars

August 5, 2023

You need THIS !!!!

This a a necessity when connecting to a water filter


Originally reviewed on HyrdraPak LLC

2 out of 5 stars

July 26, 2023

Works great... when it works

I bought this cap last year for a backpacking trip. I was updating my water system from a hard-to-reach 3L camelbak reservoir to 2 SmartWater bottles with sport caps and this as a collapsible, refillable dirty water bag. Combined with the 28mm filter adapter and a sawyer squeeze filter, it worked great for the first 2 uses. After this, the turn-lock system became stuck, likely due to some suspended debris from the creek I used to fill it up with. This is even with the dirt cap installed. So does the cap work well? Yes, but as soon as a bit of debris makes its way into the turn-locking mechanism used to release attachments, it becomes junk. Too bad every backpacking trip I have ever taken involves dirt of some kind.


Originally reviewed on HyrdraPak LLC

5 out of 5 stars

May 2, 2023

Game Changer!

For me, this cap is a game changer! It’s what allowed me to convert our 1 and 1.5L bottles into easily accessible water bladders for hiking. Combined with the tubes and bottles we now have a system that’s easier to clean, easier to fill up, easier to access, and easier to store than the traditional water bladder. The cap snaps in seamlessly to the tube and disconnects just as easily. Would highly recommend.


Originally reviewed on HyrdraPak LLC

5 out of 5 stars

January 31, 2023

Get one

Great convenient conversion to a tap. Filling cups of washing up.


Originally reviewed on HyrdraPak LLC

4 out of 5 stars

January 5, 2023

Great product which adds a ton of versatility

Great product. I love the versatility my new Flux, Plus n play and hydration tube provide. The one drawback is, this plug n play can be a little tough and tricky to turn the cap and insert the adapters. Especially if you have cold fingertips


Originally reviewed on HyrdraPak LLC

5 out of 5 stars

December 22, 2022

Great system for one handed filling

The camp tap coupled with the plug-n-play cap was awesome. It is so easy to fill up my water bottle, stove, etc. I used them both attached to the 3L HydraPak bladder on a two night backpacking trip. It was hung upside down on a rope line for two days and it didn't leak. So far, so good. I use the original cap on the bladder for transportation when filled.

Happy on the river

Originally reviewed on HyrdraPak LLC