A small smell proof container holds 1 g to 28 g of cannabis flower. Common formats are a 2 oz to 8 oz glass jar with a silicone gasket, a carbon-lined pouch, a 4 in by 6 in Mylar bag, and a hard case with a foam insert. Odor reduction runs from partial to near total. No container sold at consumer prices removes all smell.
How odor leaves a container
Terpenes are volatile organic compounds. Myrcene, limonene, pinene, and linalool evaporate at room temperature. A closed jar traps that vapor. The vapor leaves by three paths: gaps at the lid, the wall material, and the moment the lid opens.
Glass blocks vapor. Polyethylene and polypropylene pass small amounts over days. Mylar, an aluminized polyester film, blocks more. Activated carbon adds adsorption. Carbon pores bind VOC molecules on contact. Pores fill over time, and the carbon layer stops working.
Container sizes
- 2 oz jar: about 3.5 g, or one eighth ounce.
- 4 oz jar: 7 g to 14 g.
- 8 oz jar: 14 g to 28 g.
- 4 in by 6 in pouch: 3.5 g to 7 g in a single layer.
- Pocket hard case, 3 in by 5 in: 1 g to 7 g plus a lighter.
What to check before buying
- Gasket material. Silicone seals against air. Silicone also holds odor after contact.
- Lid threads. More turns equal a tighter closure.
- Child-resistant closure. 16 CFR 1700.15 applies to packaging covered by the Poison Prevention Packaging Act. ISO 8317 covers reclosable child-resistant packages.
- Light block. Amber or opaque walls. UV light converts THC to CBN.
- Washability. Glass and hard plastic wipe clean. Carbon liners do not.
Storage conditions
Flower keeps at 58% to 62% relative humidity and 60 F to 70 F. Keep the jar out of sunlight and out of a car. Glass does not absorb odor, so a clean jar carries no smell from a prior batch.
Smell Proof Jar for Cannabis: What It Does and How to Choose
Limits
Human detection thresholds for some odor compounds fall in the parts-per-billion range. A container lowers vapor concentration. It does not reach zero. Opening the lid releases the trapped headspace in one step. Dogs detect at thresholds below human range. For travel, double bag: carbon pouch inside a sealed hard case.