49 CFR § 173.322 - Ethyl chloride.
(c) In 1A1 drums of not over 100 L (26 gallons) capacity each; or
(e) In capsules under the following conditions:
(1) The mass of gas must not exceed 150 g (5.30 ounces) per capsule;
(2) The capsule must be free of faults liable to impair its strength;
(3) The leakproofness integrity of the closure must be maintained by a secondary means (e.g., cap, crown, seal, binding, etc.) capable of preventing any leakage of the closure while in transportation; and
(4) The capsules must be placed in a strong outer packaging suitable for the contents and may not exceed a gross mass of 75 kg (165 pounds).
The following state regulations pages link to this page.