Sea to Summit Pack Tap

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Manufacturer Description

Hang this from a tree at the campsite and you have bulk water literally on tap! Great for groups, kayaking or whenever you have to carry a lot of water. Multiple Hypalon lash points allow you to hang or secure the Pack Tap in many spots.

They can be rolled and squeezed into tight spaces – the fabrics used are very abrasion resistant and the double bladders will withstand significant pressure.

The bladders themselves are Mylar, and are completely after taste-free: they are based on the same material used for wine bladders.


  • Double layer tough Mylar bladder
  • 420 D ripstop nylon exterior
  • Easy one-handed operation
  • Multiple Hypalon lash points
  • Security cap on tap
  • Available in 2, 4, 6, and 10 Liter Versions
  • Tested 4 Liter version
    • Weight – 114 g (4 oz)
    • Dimensions – 29 cm x 29 cm (11.4 in x 11.4 in)
  • Retail – $25 for 4 Liter version

YMMV Review

The Sea to Summit Pack Tap is an essential item in some circumstances and a luxury item in others. For my testing it was more of a luxury and I liked it.

Back View

Design ★★★★☆

The Sea to Summit Pack Tap is a water bladder that takes up little space when empty and can be attached in a number of places when full. They make it in 2, 4, 6, and 10 liter versions. The inside bladder is made out of 2 layers of tough Mylar. Mylar is the trade name of BoPET (Biaxially-oriented polyethylene terephthalate). Mylar is a polyester film made from stretched PET and is used for its high tensile strength among other attributes. BoPET is used in other food packaging. The Mylar bladders are after taste free, based on the same material used in wine bladders.

The outside of the Pack Tap is a 420 denier ripstop nylon which protects the inner bladder. The whole bladder is really flexible. At the bottom there is a removable cap with a tap built in. There is also a security cap that covers the tap when not in use. On three corners of the Pack Tap there are Hypalon lash points for attaching it to things. There is also a strap on the front and back for transport and can also be used to attach the Pack Tap if needed. The Pack Tap at 4 liters comes in at 114 g (4 oz) and can be packed down very small. In the back of the Pack Tap there is also a zipper where you can remove the bladder if needed.

Attachment Loops and Strap

Performance ★★★½☆

Performance is tougher to rate on items such as this. The Sea to Summit Pack Tap worked as expected. The outer material is indeed tough, time will ultimately tell how durable it is so I will need to check back in if I have any issues. I do not expect to have any. The inner bladder also was after taste free which I appreciated. The attachment points are a plenty and work well with the overall shape of the bladder. It is easy to attach to a backpack and I can see other applications for use on long bike tours where you need to carry extra water. It can carry much more water for its weight than a water bottle can. On a recent trip I used the larger straps to hang it from a branch and it saved us several trip from the lake to get more water. The tap works well and is easy to operate with one hand. The Pack Tap does roll up small and the other fabric resists water well so it does not go in the pack wet. In my experience so far I have not had any issues with the Pack Tap leaking.

My only drawback is it is difficult to fill if you need to filter the water first. My water filter did not interface with the opening to the bladder so I had to manage to pump water and keep the bladder in the right spot at the same time.  This was much easier when I went with Melissa but it meant getting water was now a 2 person job. If you do not need to filter the water this becomes a mute point. Another thing of note, I tested the 4 liter version and at home in my sink I could only fill it with 3.5 liters. While still plenty of fluids, it is just good to know how much will actually fit.

The Tap

Overall ★★★½☆

Overall I was happy with the Pack Tap. It is a luxury on trip where water is readily available but at 114 g (4 oz) for the 4 liter version it may be worth taking along to save trip to the water source. When you do need to pack along extra water I see this as a great option, not only is it durable but I find it handier and lighter than other options I have tried. While not super easy to fill when also filtering the water, this was only an obstacle, not a deal breaker. You just have to be handy. =) I see this being a good option for camping away from a water source or bike touring when you need extra water. I am sure there are other activities where this can come in handy as well. At $25 for the 4 liter it is also a little less expensive than other options on the market. As always, your mileage may vary.


  • Lightweight
  • After taste free
  • Lots of attachment points
  • Tap works well
  • Does not Leak


  • Does not interface with water filter
  • Can be slightly finicky to get water to go into the bladder at first
  • Hard to get the insides dry


About the Author

I am an avid runner, cyclist, swimmer, hiker, climber, skier and many other activities that would make this list too long. I started Your Mileage May Vary Reviews in Early 2011 to combine two of my passions: sports and gear.

2 Responses to “Sea to Summit Pack Tap”

  1. Drew Hagemann

    The bladder cannot be completely drained, leaving a couple of ounces of water inside to fester and turn sour. My 2-liter bladder had to be removed from the nylon case to reach the 2-liter capacity. There is a clear plastic layer inside the bladder between the layers of mylar that traps the water and prevents it from pouring out of the spout. This is a bad design.

    • Drew,

      Sorry to here you have not had luck with the Pack Tap. I would agree that this like many hydration bladders are difficult to get dry inside. I have become accustomed to having to insert a plastic piece inside the bladder to open it up and help it dry. Very similar to what I need to do with most of my hydration bladders. While not ideal I have not ran into a bladder like this I have not had to do this with. Let me know if you have any questions on how I do this or if you have had a bladder where you have had a better experience. For hydration bladders, the Hydrapak bladders can be turned inside out to dry and clean. That is a great idea!

      Thanks, JJ

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