DayCap™ In-Bottle Filter

  • DayCap™ In-Bottle Filter
  • DayCap™ In-Bottle Filter | Compatibility (bottles not included)
  • DayCap™ In-Bottle Filter Overview Video
  • DayCap™ In-Bottle Filter | Cap Closed
  • DayCap™ In-Bottle Filter | Cap Open
  • DayCap™ In-Bottle Filter | Photo: Mirae Campbell
  • DayCap™ In-Bottle Filter | Photo: Mirae Campbell
  • DayCap™ In-Bottle Filter | Photo: Mirae Campbell
  • DayCap™ In-Bottle Filter | Photo: Mirae Campbell
  • DayCap™ In-Bottle Filter | Detachable Filter
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Platypus

DayCap™ In-Bottle Filter

$49.95
$49.95
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Transforms your favorite wide-mouth bottle into a fast and easy water filter.
  • Easy-to-Use: The drink experience is practically the same as without the filter thanks to the high-speed filter and the flow-optimized spout.
  • Proven Filtration: Hollow fiber filtration media is the same technology as our most popular and field-proven filters, with a flow rate up to 1 liter per minute.
  • Safe & Effective: Each filter is individually tested to ensure it meets all EPA & NSF guidelines for the removal of 99.9999% of bacteria and 99.9% of protozoa.*
  • Easy Cleaning: Simply shake to clean with it attached to your bottle to break up particulates and restore flow rates.
  • Optimized Design: Filter detaches with an easy half turn for cap-only mode while the semi-flexible carry loop is a sturdy attachment point.
  • Premium Materials: TPE mold construction is durable, grips well and complements the quality of your bottle.

    • Comes with DayCap cap and removeable filter cartridge.

    *Includes Giardia, Cryptosporidium, E. coli, Salmonella and V. cholerae.

Made in Market
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WARNING:
Important Proposition 65 Information for California residents

Description

You’ve already got the water bottle, now you just need the clean water. The DayCap In-Bottle Filter seamlessly fits onto three popular wide-mouth water bottles—Nalgene®, Hydro Flask®, and Yeti® Yonder™—and transforms them into fast, safe and incredibly easy water filters. The removable filter utilizes the same hollow fiber technology as our award-winning backpacking filter systems to filter water safely and quickly. By only lightly pulling water through the spout, the speed of the filter allows you to drink as you normally would from your bottle. If the flow begins to slow down, simply shake your bottle with the DayCap and filter attached to clean it and restore the flow rate. Made of premium materials, the cap is durable, and features a sturdy loop for secure hanging and carrying. The spout is shaped to optimize flow and provide a natural drink experience. It has a flip-up leak-free cover that stays out of the way when you’re drinking. In cap-only mode, the DayCap works as a perfect everyday cap for your bottle when you’re not on the trail. With the filter on, whether it’s a day hike or a backpacking trip, the DayCap In-Bottle Filter makes worry-free hydration as easy as scooping and drinking.

Tech Specs

Weight:
2.6 oz. (74 g)
Dimensions:
3.9 x 2.8 x 4.2 in (9.9 x 7.1 x 10.6 cm)
Effective Against Bacteria:
Yes
Effective Against Chemicals/Toxins:
No
Effective Against Particulate:
Yes
Effective Against Protozoa:
Yes
Effective Against Viruses:
No
Filter Media:
Hollow Fiber
Filter Pore Size (Microns):
0.2
Flow Rate:
1 L/min
Cartridge Life:
1,000 Liters
Field Cleanable:
Yes
Water Bottle Adapter:
Yes
Materials:
Plastic
Country of Origin:
Made in U.S.A. of U.S. and Imported Materials
SKU:
13878

Video Gallery

FAQs and Documents

With which bottles is my DayCap compatible?

The DayCap is compatible with the following wide-mouth water bottles: Nalgene® Wide Mouth, Hydro Flask® Wide Mouth, Yeti® Yonder™, CamelBak® Wide Mouth.

How often should I clean my DayCap?

That often depends on the clarity/quality of water being filtered. However proactive cleaning will keep your filter flowing faster for longer. Use your best judgement but consider quickly shaking it clean each time you fill your bottle with dirty water.

Do any of your products contain BPA, BPS, phthalates, or use polycarbonate?

No. All Platypus hydration products are 100% BPA-, BPS- and phthalate-free, and do not use polycarbonate.

Will the DayCap filter remove unpleasant tastes?

No. Hollow fiber filter media does not remove tastes from water.

How do I disinfect my DayCap filter?

To disinfect your DayCap Filter and water bottle, make a bleach solution in the bottle by combining 3mL (or approx. 1/4 tsp) of bleach with 1L of clean/clear water. Then perform a shake-to-clean procedure (see instructions). Then, allow the bottle to sit on its side for 30 minutes, then roll the bottle to the opposite side and allow the bottle to sit for another 30 minutes.

Is the DayCap in-bottle filter dishwasher safe?

The cap component of the DayCap is dishwasher safe. The filter component IS NOT dishwasher safe. A dishwasher cycle will permanently damage filter cartridge and make it unsafe to use.

Are there any issues with using the DayCap in-bottle filter in freezing conditions?

A DayCap that has been recently used to filter water will have wet hollow fibers, which can freeze and break the fibers. Broken fibers no longer filter water. It is important to prevent hollow fiber filters from freezing.

If you are expecting freezing or near-freezing temperatures, we recommend carrying or stowing the filter cartridge near your body (e.g., in a chest pocket) and bringing the filter into your sleeping bag overnight. (Place it in a plastic bag to prevent it from leaking).

If you think your filter may have been damaged by freezing, perform a filter integrity check before the next use to determine if it is still safely filtering water (see instructions for your filter product). Consider carrying a replacement filter as a backup in case of a failed integrity test.

What if my DayCap takes a hard drop?

Hollow fibers can break due to impact. Once broken, they will no longer safely filter water. Often your DayCap Filter will be protected from impact by being inside your bottle, but in the event of it directly hitting the ground, perform an integrity check before the next use to determine if it is still safely filtering water (see instructions for your filter product). Consider carrying a replacement filter as a backup in case of a failed integrity test.

Shipping and Returns

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No Hassle Returns

We accept returns within 30 days of purchase. All returned items must be in new condition. Please be sure no dirt, grass or pet hair is on the item you are returning. Learn More

We Believe in What We Build

At Platypus, we take pride in engineering the highest-quality outdoor gear available, and we stand behind everything we make. Platypus gear is built to be exceptionally durable and easily repaired. And we back it up with the best service in the industry, all to keep your gear performing for you—and out of landfills. Visit our Platypus warranty page for more info.

Portrait of our repair shop crew

Overall rating: 4.7 / 5 from 10 reviews.

AI Generated Review Summary

Summary topics

Review topics: [bottle, hikes, filter].

Review highlights

Reviews

Carbon filter?!

"Love the product but a replacement filter with carbon would make it even better!!"

— EZ (5/5)

Safe Hydration for Mountain Adventures

"As a guide, I spend long days in high altitudes, often relying on rivers, streams, or glacial lagoons for water. In places like the “Nido de Cóndores” camp on Aconcagua, I’ve seen many climbers struggle with stomach issues after drinking untreated water from the frozen lagoon. Having the DayCap™ In-Bottle Filter makes a huge difference—it allows me to stay healthy, energized, and focused on what truly matters: reaching the summit and supporting my team. The best part is that it doesn’t add extra bulk or weight, since I already carry a bottle. It’s all gain, especially for my health and performance in the mountains. A simple, reliable solution that I now consider essential."

— Gabriel A. (5/5)

Love being able to filter

"Love being able to filter water straight out of the bottle!"

— James D. (5/5)

Unlimited water supply

"Used for kayaking in Georgian Bay. Unlimited supplied of water throughout the day. Just unscrew the lid, reach over the side and another full bottle to drink from."

— Tim L. (5/5)

Saw this on social media

"Saw this on social media and had to buy one! Just used it this past weekend while climbing on a hot day. Filled up my bottle in a little stream while hiking back and instantly had fresh, cold water! Highly recommend!"

— Torey P. (5/5)

I bought this for a

"I bought this for a trip to Disneyland (the water there is over chlorinated and I didn’t want to buy plastic bottles), and it worked perfectly! No complaints, and I recommend to everyone."

— Rebecca T. (5/5)

DayCap in bottle filter

"Easy to change, kept me from potentially getting sick and fits my Nalgene."

— Heather S. (5/5)

I like to use this

"I like to use this while traveling to countries where the water may be suspect. I want to avoid buying bottled water and creating more landfill. Will likely also use when hiking/backpacking so that I can fill up at a stream. Initially I noticed a bit of a plastic taste but I don't notice that anymore."

— Lawrence K. (4/5)

The best filter for hikers and climbers

"This changed the way we hike and rock climb. Amazing to be able to filter right out of my favorite Nalgene. Fast flow rate without any straws or other annoying attachments. Have been looking everywhere for a water solution and this is the best by far!"

— Cody V. (5/5)

Good for day hikes, not for backpacking

"This is a good day hiking filter, where you’ll just be filling it and drinking (only very light suction is needed to pull water through the filter. This is not a good backpacking filter because it’s very difficult to filter from one container to another (for example, into a cook pot), and impossible to do so from a hard-sided container like a Nalgene Tristan bottle. It’spossible to squeeze water through the filter on a Nalgene “ultralight” polyethylene bottle, or even an MSR Dromlite reservoir, but it’s a slow, awkward process."

— Glenn R. (3/5)

Q&A