This is a traditional Chinese water-seal glass pickle jar (often called a Sichuan Paocai jar). It features a unique double-lid moat design at the top: you pour water into the rim around the lid to create an airtight seal that lets fermentation gases escape while keeping outside air out. Traditional Glass Fermentation Jar:Best For: Authentic fermentation of kimchi, sauerkraut, and pickled vegetables.Standout Feature: Uses a traditional water-groove moat around the lid. How it works: You fill the outer rim with water, which allows fermentation gases to escape while completely blocking oxygen and pests from getting in. Side-by-Side Size Comparison Attribute 2500ml Jar (2.5L) 5000ml Jar (5L) 6500ml Jar (6.5L) Approx. Imperial Capacity ~84.5 fl oz (0.66 Gallon) ~169 fl oz (1.32 Gallons) ~220 fl oz (1.71 Gallons) Common Height Range 22 - 25 cm 30 - 32 cm 35 - 38 cm Common Diameter Range 14 - 16 cm 18 - 20 cm 20 - 22 cm Best Used For Small batches / Countertop display Standard family pickling / Kimchi Bulk preservation / Commercial display Est. Filled Weight ~3.5 kg (7.7 lbs) ~7.0 kg (15.4 lbs) ~9.0 kg (19.8 lbs) Functional Use Cases • 2500ml Jar: Smallest tier. Fits easily on standard refrigerator or pantry shelves. Best for quick-pickled cucumbers, sliced jalapenos, or storing dry goods • 5000ml Jar: Mid-size giant. Heavy when fully packed with brine. Ideal for whole cabbage Kimchi fermentation or large batches of whole dill pickles. • 6500ml Jar: Maximum capacity tier. Designed for deep-pantry bulk winter storage. Requires significant physical counter space and dual-handed lifting.