Zpacks Offers the Best Lightweight Backpacking Gear: The Ultralight 1/2" Side Release Buckles have a slim profile but are much stronger than the generic half inch (10 mm) buckles you may find elsewhere. They can handle being tensioned down tight whereas other small buckles will snap.
Ultralight Line Lock Side Release Buckle - 10mm
9094 & 9095 1 1/4 MOJAVE HEAVY DUTY SIDE SQUEEZE BUCKLE - Side Release Buckles - Granat Industries, Inc.
, Available in Silver, Gold, Gunmetal & Matte Black
1.5 Metal Side Release Buckle
Replacement Buckles - f-stop Gear
PH328 Dual Adjustable Side Release Buckle
Duraflex Buckles
Lightweight but durable buckle! Smooth release and glove friendly., Tensile strength:, 10mm: 41kg, 15mm: 52kg, 20mm: 69kg, 25mm
Spider buckle
PH328 Dual Adjustable Side Release Buckle
Dual Side Release - StrapRyte® - Narrow Fabrics Specialist
Dual Side Release - StrapRyte® - Narrow Fabrics Specialist
5433/5431 2 Lock Monster Plastic Side Release Buckle