Want to put them in emergency kits (car, camp, pack, bug out bag) and want to know if they'll stay any fresher, or last longer if I vacuumed sealed?

Vacuum sealing will not extend storage life as the cyalume chemical is already sealed in an air tight tube which prevents leakage and exposure to air. Temperature is a much more important factor. Heat will decrease their shelf life so I'd consider storing them in a cool place.

Would it be safe to put in water bottle (that I drink out of)? Easier to find at night.

Manufacturer says that they only last a year if not in the foil package, versus 4 to 5 years in the foil. This implies some gas or vapor is leaking out of after it's out of the foil package. Most gases would condense in contact with water, so you would drink it, whatever it is. I wouldn't.

Can these really be used as a light source in the dark? I mean can you see other things in its light?

Yes. They are perfect for changing a tire in darkness. I used three additional lights for safety, collision avoidance behind my vehicle while on a dark road to change a tire. They are very bright at first, but the time the light continues to illuminate is not as advertised. The brightness begins to deteriorate after a few hours. They do continue to emit illumination, but after 6 hours you will not be able to do very much. After 8 hours they are almost out. They work great for power outages. The 20 pack is good if the power is out more than 6 hours. You can attach these to kids who are out in the dark (Trick or Treat) or to enhance any costumes. I recommend the 20 pack. Keep a few in your vehicles, garage, and one in each room of your home. They have a shelf life. I received mine in 2013 and they expire in 2017. I do not know how long they sat in storage prior to delivery. Check the expiration date if you get them to make sure they are not about or already expired. If so, send them back. Good luck.

Can I remove these from the wrapper to save space in my edc bag? The plastic wrapper easily adds a few inches to the length of the stick.

Don't remove the wrapper until you intend to activate the stick. The wrapper the stick is in, protects it, literally keeps it 'fresh' - the stick will degrade (unsnapped) faster & sooner, if the wrapper is even damaged. What would actually be best if packing them in an EDC or BOB - is a hard case for the sticks (still wrapped!) so other items don't tear or puncture the wrapper.

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Description

💡 Light up your world—because being prepared never looked this cool!

ECO CONSCIOUS SAFE - Non-toxic, non-flammable, phthalate-free, and recyclable materials ensure safety for you and the planet.
MILITARY GRADE TOUGHNESS - Trusted by US military personnel, engineered to meet rigorous DLA and NAMSA standards for reliability.
WATERPROOF FLOAT READY - Perfect for any environment—rain, water, or confined spaces—these sticks keep glowing without fail.
UNMATCHED 12 HOUR ILLUMINATION - Stay visible and safe with a full half-day of bright green light that outlasts typical glow sticks.
INSTANT ACTIVATION ZERO HASSLE - Just bend, snap, and shake to flood your surroundings with 360° green light—no batteries or flames needed.

The Cyalume SnapLight Green Glow Sticks are 6-inch industrial-grade chem lights designed for up to 12 hours of bright, 360-degree green illumination. Waterproof, non-toxic, and non-flammable, these military-spec glow sticks meet DLA and NAMSA standards and are trusted by US military personnel. Each stick activates instantly with a simple bend and snap, floats on water, and offers a five-year shelf life, making them the ultimate reliable emergency lighting solution for professionals and adventurers alike.

Specifications

Brand	Cyalume
Colour	Green
Specific Uses For Product	Interior
Vehicle Service Type	Multiple vehicle types
Special Feature	Waterproof
Lens Colour	Green
Lens Material	Polyethylene
Item dimensions L x W x H	21.6 x 10.2 x 7.6 Centimeters
UPC	735090759995 816908010573
Assembly Required	No
Manufacturer	Cyalume Technologies
Country of Origin	USA
Model number	9-00720
Number of Memory Sticks	20
Item Weight	45.4 g
Product Dimensions	21.59 x 10.21 x 7.59 cm; 45.36 g
Item model number	9-00720
Item Height	2.99 Inches
Item Width	4.02 Inches
Are batteries included?	No

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