Knives that weigh 2 ounces (56g)  or less.

The first hiking knife I purchase was the Mini Buck but I traded up to a Gerber 06050. The mini buck is perfect for a key ring but the slightly larger Gerber is easier to hold for my hand and a better feel for not a lot of additional weight.

Buck Knives Mini Buck Buck mini 1 ounce (28 g)

Blade Length: 1 7/8″ (4.8 cm)
Blade Material: 420HC
Carry System: Pocket
Handle Material: Valox
Length Closed: 2 7/8″ (7.3 cm)

Columbia River Delilah’s P.E.C.K Columbia_River-Delilahs_peck It weighs less than 1 oz. and is only 2.625 inches long when closed. Blade 1.75″
EKA Compact EKA_compact Sandvik stainless blade is about 2 1/4″ long and .075″ thick. The knife is about 3 1/2″ closed.

Weighs < 1 1/2 ounces

Gerber 06050 gerber_06050 Overall Length: 4.62″
Blade Length: 1.96″
Closed Length: 2.65″
Weight: 0.6 oz.
Lock Mechanism: Lock-back
Blade Style: Drop Point Blade
Material: 420HC Stainless Steel Blade
Gerber 6009 gerber_6009 Brought to market back in 1980 by Pete Gerber.

Overall Length: 6.1-Inch,

Length Closed: 3.61-Inch,

Length of Blade: 2.63-Inch,

Weight: 1-1/5-Ounce. While a little heavier than the 06050 it has the utility of being a bit larger.

Kershaw Ken Onion Chive Kershaw-chive 2 inch blade
3 inch closed length
weighs 1.9 oz (54g)
Smith & Wesson Little Pal smith_wesson_little+pal Blade Length: 2.28″
Closed: 3.03″
Steel: 440C Stainless Steel
Weight: 1oz (28g)
SpyderCo Salt 1 spyderco_rustproof-salt-1 Overall Length: 7 in.
Length of Blade: 4 in.
Model: Salt 1
Weight: 2 oz. (57g)
Victorinox Swiss Army Classic victorinox_swiss_army_classic There are heaps to choose from…