Composition Growlers are generally made of glass and have either a
screw-on cap or a hinged porcelain gasket
cap, which can maintain freshness for a week or more. A properly sealed growler will hold
carbonation indefinitely and store beer like any other sanitized bottle. Some growler caps are equipped with valves to allow replacement of
carbon dioxide lost while racking. The modern glass growler was first introduced by Charlie and Ernie Otto of
Otto Brothers' Brewing Company in Wilson, Wyoming, in 1989. The two most popular colors for growlers are amber (a brownish hue) or clear (often called "flint"). Clear growlers are often 25% to 35% more per unit than their amber counterparts. Glass handles are the most common type of handle for growlers, although metal handles, with more ornate designs, can also be found. Some growlers do not have handles; this is especially common with growlers smaller than 64 U.S. fl oz that have Grolsch-style
flip-tops.
Use Growlers can be refilled for between $5 and $30 in the United States. Their initial purchase can carry a significant (sometimes non-compulsory)
deposit. In
Hanoi, the Habeco Beer Hanoi company stores, Bia Ơi, charges a 100,000 VNĐ deposit for both one and two liter stainless steel
bia hơi growlers. Instead of being refilled, the growlers are exchanged for prefilled chilled ones. ==Sizes==