Pack up to ½ ounces or 20 grams of medicinal dry herb in the .29L TightVac container. That’s more than twice as much its cousin, the .12L TightVac. This container keeps any dry herb strain fresh for up to a year, and acts as a discreet herb container for traveling. Available in 3 styles--Clear, Solid, and Tint--the TightVac preserves dry herb for as long as a year. The 2 way valve will release gas build-up over time without letting in oxygen, keeping herb fresh. Constructed from strong plastic, the TightVac can last up to 10 years if maintained properly.