27 CFR 5.203 — "Standards of fill (container sizes)" — sits in Subpart K of TTB's distilled spirits regulations and does one thing: it enumerates the only container sizes in which distilled spirits may be bottled or imported for the U.S. market. Standards of fill date to the era after Prohibition, and their rationale is consumer protection through comparability — a limited set of sizes prevents deceptive packages (a 725 mL bottle priced and shelved like a 750) and lets shoppers compare prices per unit at a glance. The section was most recently overhauled effective January 10, 2025 by T.D. TTB-200 (90 FR 1876), the largest expansion of the spirits list ever.

The Current Authorized List (25 Sizes)

Under § 5.203(a), the following metric standards of fill are authorized for distilled spirits, whether domestically bottled or imported:

• Liters: 3.75 L, 3 L, 2 L, 1.8 L, 1.75 L, 1.5 L, 1.00 L

• Milliliters: 945, 900, 750, 720, 710, 700, 570, 500, 475, 375, 355, 350, 331, 250, 200, 187, 100, and 50 mL

That is the complete list — 25 sizes, from the 50 mL miniature to the 3.75 L handle-plus format. Net contents must be labeled in metric under § 5.70 (a U.S. equivalent may be added), and the labeled net contents must be one of these sizes. There is no general tolerance for selling an unlisted size: a 400 mL or 650 mL bottle cannot be sold in the U.S. market even with perfectly accurate labeling. The only carve-out, § 5.203(b), grandfathers imported spirits that entered customs custody or were bottled before January 1, 1980 under the pre-metric rules — a provision that matters for vintage collectors, not new products.

How the List Got Here: 2020 and 2025 Expansions

For decades the spirits list held just seven sizes: 50, 100, 200, 375, 750 mL, 1 L, and 1.75 L. Two rulemakings transformed it:

• T.D. TTB-165 (December 29, 2020) added 700 mL, 720 mL, 900 mL, and 1.8 L — driven by trade agreements and import alignment (700 mL is the standard spirits bottle in most of the world; 720 mL and 1.8 L are standard Japanese formats), and codified permission to add U.S.-equivalent measurements alongside the mandatory metric statement

• T.D. TTB-200 (effective January 10, 2025) added the remaining sizes — 187, 250, 331, 350, 355, 475, 500, 570, 710, and 945 mL, plus 1.5 L, 2 L, 3 L, and 3.75 L — and eliminated the separate standards of fill for distilled spirits in cans, so a single unified list now applies to all container types

In the same 2025 rulemaking cycle TTB had also considered the more radical alternative of eliminating standards of fill almost entirely (subject to a minimum), but chose to retain the authorized-list approach while greatly expanding it. The new sizes are optional — nobody must repackage — and no pending TTB proposal to further amend the spirits list exists as of August 2026.

Cans, RTDs, and the End of the Can/Bottle Distinction

Before 2025, TTB maintained a separate, shorter list of authorized sizes for spirits in cans, which forced spirits-based ready-to-drink (RTD) producers into awkward formats while their malt- and wine-based competitors used standard can sizes. T.D. TTB-200 erased the distinction: 355 mL (the standard 12 oz can), 250 mL (slim can), and 473-adjacent 475 mL are now authorized for any container type, bottle or can. For the fast-growing canned cocktail category this was the headline change — a spirits RTD can now share the exact shelf format consumers expect from hard seltzer. Note that whatever the container, all other Part 5 rules still apply to cans: same mandatory label information, same same-field-of-vision placement, same COLA requirement.

Import Implications: The 700 mL World Standard

The single most consequential size on the list for importers is 700 mL — the standard bottle in the EU, UK, Japan, Australia, and most other markets — authorized for U.S. sale since the 2020 rule. Before then, foreign producers had to run separate 750 mL bottling lines solely for the American market, a real barrier for small distillers abroad; now a Scotch, Japanese whisky, or mezcal producer can ship its world-standard 700 mL bottle into the U.S. unchanged. The 2025 additions deepen the alignment: 500 mL (a common European format), 350 and 700-adjacent sizes, and 945 mL (approximating the U.S. quart) give importers and exporters near-total flexibility. The same logic runs in reverse — U.S. distillers can now bottle a single 700 mL SKU for both domestic and export markets instead of maintaining dual inventories. One caution: state law is not preempted, and a handful of states impose their own container-size restrictions or registration requirements, so a federally authorized size is necessary but not always sufficient for a 50-state launch.

Compliance Mechanics

Standards of fill enforcement happens at three points. First, at COLA review: the net contents on the label application must be an authorized size, and unlisted sizes are rejected outright. Second, at customs, where imported spirits in unauthorized containers may not be released for consumption. Third, in market enforcement, since selling spirits in unauthorized containers violates the FAA Act. A related container rule travels with § 5.203: under § 5.202(a), spirits must be bottled in standard liquor containers — containers "made, formed, and filled" so they do not mislead purchasers as to their contents, with headspace and design limits set out in the section's later paragraphs — and even an outer carton may not be designed to mislead purchasers about the size of the bottle inside. When planning a new SKU, treat the size decision as a regulatory decision: confirm the size is on the § 5.203(a) list, confirm the label's net contents statement matches exactly, and check destination-state rules before committing to glass.

How Truli Helps with Standards of Fill Compliance

• Authorized-size verification: Truli's AI agents check every label's net contents statement against the current 25-size § 5.203(a) list, catching unauthorized sizes before COLA submission

• Net contents format checks: Truli validates metric-first labeling under § 5.70, including optional U.S.-equivalent statements and placement rules

• Import readiness review: Truli flags container-size issues for import labels — including 700 mL world-standard bottles and Japanese 720 mL/1.8 L formats — alongside the rest of Part 5

• Rule-change monitoring: Truli tracks TTB rulemaking, so when the standards of fill list changes (as it did in 2020 and 2025), your size checks update with it

Related Regulations

• 27 CFR Part 5 — TTB Distilled Spirits Labeling Requirements — The parent guide to all Part 5 labeling rules

• 27 CFR 5.63 — Mandatory Label Information — Where net contents fits among the required label statements

• 27 CFR 5.65 — Alcohol Content and Proof — The companion numeric statement every container must carry

• 27 CFR Part 13 — COLA Label Approval — The approval gate where unauthorized container sizes are rejected

• 27 CFR 5.143 — Whisky Types — Bourbon, Rye, and Single Malt — Class and type rules that apply regardless of container size

Frequently Asked Questions

Can I sell spirits in a 12 oz (355 mL) can?
Yes — since T.D. TTB-200 took effect on January 10, 2025, 355 mL is an authorized standard of fill for distilled spirits in any container type. TTB eliminated the old separate (and shorter) list of can sizes, so bottles and cans now follow the same 25-size list in § 5.203(a).

Are 700 mL bottles legal in the United States?
Yes. TTB authorized 700 mL — the standard bottle size in most of the world — in December 2020 (T.D. TTB-165), along with 720 mL, 900 mL, and 1.8 L. Importers no longer need market-specific 750 mL bottling runs, and U.S. exporters can use one bottle globally.

Do I have to switch to the new sizes?
No. The 2020 and 2025 additions are optional — existing sizes like 750 mL, 1 L, and 1.75 L remain fully authorized. But any size you choose must be on the list: sizes between the authorized values (say, 600 mL) remain prohibited, and some states add their own container restrictions on top of the federal list.

A note from Truli: Truli is not a law firm, and this article does not constitute or contain legal advice or create an attorney-client relationship. When determining your obligations and compliance with respect to relevant laws and regulations, you should consult a licensed attorney.

Last updated: August 2026. Reflects 27 CFR 5.203 as of August 2026, including the January 2025 expansion (T.D. TTB-200). Truli monitors TTB rulemaking and enforcement. Book a demo to see how.