Is it stretchy or sturdy?

It has been sturdy for me, not really stretchy. But easily adjusted to different lengths.

Is this strong enough to ruck 30+ lb? Is there any warranty if the buckle breaks?

I would say it would work if your straps are thick on your pack (the straps that will slide in the buckles). The buckles that slide on my bag keep popping off because my webbing that I'm using on my bag is thinner than the plastic "slide on" buckles, so they keep popping off, it's pretty annoying.

How narrow can this be tightened?

Not much less than 3 inches between backpack straps. The buckle itself takes up about 2 in

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🖤 Elevate your carry game with the toughest, comfiest sternum strap around!

CUSTOM FIT COMFORT - Fully adjustable sternum strap ensures a perfect, secure fit for every backpacker.
PRESSURE FREE WEAR - Integrated elastic segment absorbs movement, preventing chest discomfort during long hauls.
UNMATCHED STRENGTH - 25MM webbing and buckle deliver superior durability over standard 20MM options.
LIGHTWEIGHT COMPACT - At just 45g and small package size, it’s the ultimate no-bulk upgrade for your gear.
SLEEK MINIMALIST DESIGN - Matte black nylon blends seamlessly with any backpack style for a professional look.

The YYST Sternum Strap Backpack Chest Harness is a premium nylon accessory designed for backpacks with up to 25MM webbing. Featuring a stronger 25MM buckle, adjustable length, and an elastic section for enhanced comfort, it offers durability and ergonomic support for professionals and adventurers alike.

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Color	black
Material Type	Nylon
Batteries Included?	No
Brand	YYST
Manufacturer	YYST
Item model number	YYST-2
Package Dimensions	10.4 x 6.3 x 3.2 cm; 45.36 g
ASIN	B07D3RGMNM

YYST Sternum Strap Backpack Chest Harness for Backpack with 20MM or 25MM Webbing

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