What Size Jar Holds 5 lbs of Flour? The Complete Jar Size Breakdown

The most common question we get: “I want to put a 5 lb bag of flour in a jar — which size do I actually need?” Short answer: a 1-gallon jar holds a full 5 lb bag of all-purpose flour with room to spare. Here's the complete breakdown so you buy right the first time.

Flour, by jar size

64 oz / half gallon: holds about 3.5–4 lbs of flour — most of a 5 lb bag, but not all of it. Choose this size for sugar (a 4 lb bag fits perfectly), coffee beans, rice, or oats rather than a full flour bag.

1 gallon: the flour jar. A standard 5 lb bag of all-purpose flour pours in completely, with headroom to scoop without spilling. This is why the 1 gallon mason jar with metal lid is our best seller — it's sized around the most common bag in American pantries.

1.5 gallon: holds a 5 lb bag plus a partial second, or roughly 8 lbs. The right call if you bake weekly and top off before the jar empties.

2 gallon: swallows a 10 lb warehouse-club bag of flour or rice. If you shop at Costco or BJ's, this is your size — see our full mason jar lineup for square 2-gallon options that sit flush on a shelf.

Why wide mouth matters more than you think

A jar that fits the flour but not your measuring cup is a daily annoyance. Wide-mouth jars accept a full 1-cup measure with knuckle room, so you scoop and level right in the jar — no funnels, no transfer containers, no flour dust on the counter.

Quick reference for other staples

Granulated sugar (4 lb bag) → half gallon. Rice (5 lb bag) → 1 gallon. Rolled oats (42 oz canister) → half gallon. Pasta (1 lb boxes) → one gallon holds 3–4 boxes. Pet food and treats scale the same way — a 2-gallon jar handles most large treat bags.

Still deciding? The 30-second jar size guide covers every size we make, and everything in the mason jar collection is in stock and ships in protective glass packaging from New Jersey.