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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💡 Light up your safety game—because when it’s green, it’s go time!

WATERPROOF NON FLAMMABLE - Safe to use underwater or in confined spaces—your go-to tactical light source.
UNMATCHED 12 HOUR ILLUMINATION - Stay lit through every emergency or adventure with a full half-day of reliable glow.
CERTIFIED MILITARY GRADE QUALITY - Trusted by US military standards for ultimate performance and rugged reliability.
SAFER ALTERNATIVE TO ROAD FLARES - Non-toxic, durable chem lights that protect you and your environment without the fire risk.
BULK PACK OF 20 FOR MAXIMUM READINESS - Never run out—perfect for teams, emergency kits, or large-scale preparedness.

The CyalumeGlow Military Grade 6” Green Lightsticks deliver 12 hours of bright, waterproof, and non-flammable illumination. Certified to meet rigorous US military standards, this bulk pack of 20 chem lights ensures dependable, safe lighting for emergencies, tactical operations, and outdoor adventures—no batteries required.

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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Manufacturer	Cyalume Technologies
Part number	9-00720
Item Weight	45.4 g
Product Dimensions	21.59 x 10.21 x 7.59 cm; 45.36 g
Item model number	9-00720
Size	20 Pack
Colour	Green
Item Package Quantity	1
Special Features	Waterproof
Specific uses	Exterior
Batteries included?	No
Batteries Required?	No

CyalumeGlow Sticks Military Grade Lightstick - Premium Green 6” SnapLight Emergency Chemical Light Stick with 12 Hour Duration (Bulk Pack of 20 Chem Lights)

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