Would this be good for attaching a lunch bag with handles to a backpack?

you will need a larger size. these are snall key chain size.

I purchased a pair of the #1 at big box hardware store, not being sure it was the right size I also bought the #3 because that's what they had. I now know that the #1 will accept door and lock keys but will not work with modern car keys that are FOBs. The #3 will accept the FOBs but is larger than I want as my objective is reducing size & weight of my keys. I am here to purchase #2 which was not offered at the store. I am getting 3 of them at this price since I paid $6.72 not incl tax for 2-#1 & 1-#3.

How safe is the lock? will it break along in time? I use carabiner key chains but the break

These come in various sizes and are made in both metal (hardened stainless steel) and plastic.The smallest sre less than an inch long and rated at about 4 pounds The largest (#4) are about 1.5 x 3 inches and are rated at 75 lbs (33KG)The plastic ones are not very strong, the metal ones are extremely strong for their size.They are mad of a hardened alloy so tough that in an emergency use as a pry bar the metal snapped before it bent.That said, these are not meant to be used for climbing or rigging.I have used a chain of these to hold keys and small tools for ten yearsThey held up very well for my usesThe locking variety is new. The lock mechanism is a plastic bar that rotates to block the gates.It seems sturdy and reliable but I have not tested it over time.They are very slim inprofile

Will this stick to magnets?

Yes. This will stick to magnets. If you have any other questions or concerns please call our Customer Service Team at 1-800-678-6483, M-F 9:30 AM - 3 PM MST. Or you can email us at info@niteize.com.

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Nite Ize Size-1 S-Biner Dual Spring Gate Carabiner, Black, 2-Pack

Nite Ize Size-1 S-Biner Dual Spring Gate Carabiner, Black, 2-Pack

Product ID: 223494946

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Details

Colour
black
Material
Stainless
Brand
Nite Ize
Item Weight
0.01 Kilograms
Shape
D-Shape

🔒Dual spring wire lock for secure hold

⚖️Ultra-lightweight at just 0.01 kg

🛠️Premium stainless steel durability

Description

🔗 Lock in reliability, unlock your adventure!

COMPACT LIGHTWEIGHT - Slim 40x16mm size with featherlight 0.01 kg weight—carry more, hassle less.
TRUSTED BRAND QUALITY - Nite Ize original, made in the USA—gear up with confidence.
SECURE DUAL SPRING GATE - Wire lock design ensures your gear stays put—no accidental slips.
VERSATILE D SHAPE DESIGN - Optimized shape for easy clipping and maximum load distribution.
RUGGED STAINLESS STEEL BUILD - Engineered for strength and corrosion resistance, ready for any adventure.

The Nite Ize Size-1 S-Biner is a compact, dual spring gate carabiner crafted from durable stainless steel. Weighing only 0.01 kg and measuring 40x16 mm, it offers secure wire lock functionality with a 5-pound load capacity. Sold as a 2-pack, this black D-shaped carabiner is perfect for professionals and outdoor enthusiasts seeking reliable, lightweight gear made in the USA.

Specifications

Colour	black
Material	Stainless Steel
Brand	Nite Ize
Item Weight	0.01 Kilograms
Shape	D-Shape
Net Quantity	2.0 count
Lock Type	Wire Lock
Carabiner gate clearance	0.7
Product Dimensions	40L x 16W Millimeters
UPC	094664008373
Global Trade Identification Number	00094664008373
Maximum Weight Recommendation	5 Pounds
Manufacturer	NITE IZE
Department	unisex-adult
Country of Origin	USA
Item model number	Stainless-Steel,
ASIN	B001DZNZZI