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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Steripen Ultra UV Water Purifier

Product ID: 49960742

Details

Brand
Steripen
Capacity
50 litres
Included components
1x Neoprene 1x
Installation type
Countertop
Material
Plastic
Package information
Bottle

💡UV-C light kills 99.9% pathogens

🔋50L per full USB charge

⏱️Treats 0.5L in 48 seconds

Description

💧 Purify on the go — because clean water waits for no one!

ADVANCED OLED DISPLAY - User-friendly interface keeps you informed on battery life and treatment status—tech that keeps you in control.
INSTANT SAFE HYDRATION - Smiley display confirms water is purified and ready to drink—no guesswork, just pure confidence.
POWER ANYWHERE ANYTIME - USB rechargeable battery powers up from laptops, solar panels, or car ports—stay hydrated off-grid without limits.
PROVEN PATHOGEN DEFENSE - Destroys 99.9% of protozoa, bacteria, and viruses including Giardia and Cryptosporidia—drink worry-free anywhere.
LIGHTWEIGHT TRAVEL READY - At just 140g and compact size, it’s the ultimate portable purifier for the millennial globetrotter.

The Steripen Ultra UV Water Purifier uses powerful UV-C light to eliminate 99.9% of harmful pathogens in clear water, delivering safe drinking water in under 90 seconds. Lightweight and USB rechargeable, it treats up to 50 liters per charge with an intuitive OLED display confirming purification success. Perfect for travelers, outdoor enthusiasts, and emergency preparedness, it combines cutting-edge technology with ultimate portability.

Specifications

ASIN	B00NK9948M
Best Sellers Rank	157,950 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 89 in Camping Water Purifiers
Brand	Steripen
Capacity	50 litres
Container Type	Bottle
Customer Reviews	4.3 4.3 out of 5 stars (909)
Global Trade Identification Number	00899321000130
Included Components	1x Neoprene sleeve, 1x USB cable, 1x Ultra UV Water Purifier with a lid
Installation Type	Countertop
Item Dimensions L x W x H	41L x 32W x 186H millimetres
Item Type Name	Ultra UV Water Purifier
Item Weight	259 g
Manufacture Year	2021
Manufacturer	Katadyn
Manufacturer Part Number	ULT-MP-EF
Material Type	Plastic
Maximum Flow Rate	2 Litres Per Minute
Model Name	Steripen Purificador de agua Ultra UV
Model Number	ULT-MP-EF
Number of Items	1
Other Special Features of the Product	Portable
Power Source	Usb Cable,Battery Powered
Product Shelf Life	7 Years
Product Warranty	2 Year Limited Warranty to be from defects in materials and workmanship
Purification Method	Ultraviolet
Supported Water TDS Level Maximum (PPM)	2000
UPC	899321000970 899321000987 899321000864 400110428167 899321000130 751738969793
Unit Count	1.0 count
Upper Temperature Rating	40 Degrees Celsius

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TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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Fantastic experience overall. Will recommend to friends and family.

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