Platypus DayCap In-Bottle Filter Cap


You’ve already got your favourite water bottle*, now you just need the clean water. The DayCap In-Bottle Filter by Platypus Hydration seamlessly fits onto three popular wide-mouth water bottles, thanks to the industry-standard cap thread design.

Your favourite vessels including: Nalgene Wide Mouth, HydroFlask or and Yeti Yonder can be transformed into fast, safe and incredibly easy water filters. The removable filter utilizes the same hollow-fibre technology as the Platypus Hydration 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.

Manufactured from 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.

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 fibre filtration media is the same technology as our most popular and field-proven filters, with a flow rate up to 1 litre 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 moulded construction is durable, grips well and complements the quality of your bottle.
Universal Thread: Thanks to a universal thread design, the Daycap can be used with a huge range of hydration products including: Nalgene Wide Mouth drink bottles, Yeti Yonder vessels, HydroFlask vessels, Sea To Summit WaterCell ST and WaterCell X, MSR Dromedary and MSR DromLite



  • Manufactured from premium 100% BPA, BPS and phthalate-free materials
  • Compatible with a range of hydration equipment and vessels* including: Nalgene® Wide Mouth, HydroFlask®, and Yeti® Yonder™
  • Use as stand-alone filtration system or remove the filter for regular every-day use
  • Instructions and safety directions included
  • Easy tool-free filter cleaning for extended service life and reliable flow rates
  • Kit includes:
    • 1 x Daycap bottle cap
    • 1 x Filter Cartridge
    • 1 x Instruction booklet
  • Flow rate <1L per minute
  • All Platypus hydration products are 100% BPA, BPS and phthalate-free, and do not use polycarbonate
  • Designed and manufactured in USA
  • NSN: N/A


  • W: 71mm (approx. Dia excl loop handle)
  • W: 98mm incl loop handle
  • L: 115mm
  • Weight: 70g
  • Element life: approx. 1000L (depending on water quality)
  • Element media: Hollow Fiber ABS (0.2microns)

* bottle / vessel is not included
** Includes Giardia, Cryptosporidium, E. coli, Salmonella and Cholera.



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  • Brand: PLATYPUS
  • Product Code: DAYCAP
  • Availability: 2
  • AUD$104.95

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