Do you have to use it with a nalgene-type container? Would it work with a flexible bag-like container?

Bag should work fine I think. As long as the mouth is wide enough to fit the whole pen in.

Will the water in my Hydroflask stay purified after using the Steripen if I’m not drinking the whole bottle at once, or do have to repeat the process?

my Daughter and I used it for a week on the Appalachian Trail and we were fine. We did not re-sterilize our water bottle every time we drank from it—only using the steri pen when we initially filled the water bottle. We also used it to sterilize the water we poured into our 3 liter Camelbacks. Note that there were a couple of contaminated water advisories posted when we went, we used two purification systems-the Sawyer mini and the Steripen-just to be safe, but we never re-purified each time we drank.

Just confirming that the charging comes with it?

Depends on what you mean by "the charging." The cord comes in the box (although it's a generic cellphone type cord, anyway). A wall charger does not. Any charger into which you can plug the cable will suffice, as the SteriPen does not require a high-output wall unit.

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Description

💧 Stay safe, stay savvy—pure water, anytime, anywhere!

PORTABLE POWERHOUSE - Lightweight 140g design fits effortlessly in your bag or pocket.
SMART BATTERY ALERTS - Stay ahead with a clear display that notifies you when it’s time to recharge.
INSTANT PURE HYDRATION - Drink water immediately once the smiley lights up—no waiting, no guessing.
UNIVERSAL USB CHARGING - Charge anywhere—laptop, solar panel, or car—keeping you hydrated on the go.
ADVANCED UV C STERILIZATION - Eliminates 99.9% of protozoa, bacteria, and viruses for ultimate safety.

The Water Purifier's Ultra UV uses cutting-edge UV-C light technology to sterilize clear water by eliminating 99.9% of harmful protozoa, bacteria, and viruses. Its compact 140g design features a smart display that signals treatment success and battery status. With USB charging compatibility and a 50-liter capacity per full charge, it’s the perfect portable solution for clean drinking water wherever you go.

Specifications

Brand	SteriPen
Special Feature	Portable
Product Dimensions	7.3"L x 1.3"W x 1.6"H
Package Information	Box
Installation Type	Countertop
Power Source	Battery Powered,corded Electric
Item Weight	0.3 Pounds
Model Name	Steripen Ultra UV Water Purifier
Maximum Flow Rate	2 Liters Per Minute
Shelf Life	7 Years
UPC	899321000970 899321000987 899321000864 400110428167 899321000130 751738969793
Global Trade Identification Number	00899321000130
Manufacturer	Hydro-Photon, Inc.
Manufacture Year	2021
Item Package Dimensions L x W x H	7.99 x 4.33 x 2.17 inches
Package Weight	0.34 Kilograms
Item Dimensions LxWxH	7.3 x 1.3 x 1.6 inches
Brand Name	SteriPen
Warranty Description	3 Year Manufacturer Warranty
Color	Blue
Suggested Users	unisex-adult
Number of Items	1
Part Number	ULT-MP-EF
Model Year	2018
Style	Uv
Size	Small
Sport Type	Camping & Hiking

€ 217.00

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SteripenWater Purifier's Ultra UV

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