A 45-quart cooler holds about 11.25 gallons (42.6 liters) of volume and is a mid-sized, hard-sided unit roughly 25–26 inches long, 16–18 inches wide, and 15–17 inches tall — but exterior dimensions and can capacity vary by brand.
If you are shopping for a cooler, “45 quarts” gives you a ballpark volume, but the real-world footprint depends on which model you pick. The exterior width can range from about 16 to 18 inches, which matters for stowing behind a truck seat or on a boat deck. Interior shape also changes how many cans or bottles actually fit. Here is what the numbers mean for the three most common brands.
Exterior & Interior Dimensions by Brand
The three dominant 45-quart coolers — RTIC, YETI, and Coleman — each use different wall thicknesses and geometry, so their overall dimensions are not identical.
| Brand / Model | Exterior (L × W × H) | Interior (L × W × H) | Can Capacity (No Ice) | Weight (Empty) |
|---|---|---|---|---|
| RTIC 45 QT Ultra-Tough | 26.35″ × 18.19″ × 15.75″ | 18.90″ × 11.42″ × 10.98″ | 60 cans | 29.5 lbs |
| YETI Tundra 45 | 25.6″ × 15.9″ × 15.5″ | 18.3″ × 9.4″ × 10.7″ | 54 cans | 26 lbs |
| Coleman Pro 45-Quart | 24.53″ × 16.38″ × 17.17″ | ~19.7″ × ~11.8″ × ~12.6″ | 74 cans | 19.8 lbs |
Real Capacity: Cans, Ice, and Wine Bottles
The total volume is 45 quarts, but what you can actually pack depends on how much ice you add. With a typical 20-lb ice load, your can capacity drops by 30-40% because the ice takes up space. If you plan to use standard wine bottles, the YETI Tundra 45’s narrow interior width of 9.4 inches may not hold them standing upright. The RTIC’s interior is wider at 11.42 inches, and the Coleman’s is roughly 11.8 inches, giving you more flexibility for tall bottles.
When fully loaded with ice and drinks, a 45-quart cooler can exceed 85 lbs total weight, so plan for two people to move it.
Will It Fit in Your Vehicle?
Before buying, measure your trunk, truck bed, or boat storage compartment. The longest dimension is the length, which ranges from about 24.5 to 26.4 inches. The width is the critical fit point: the YETI Tundra 45 is the slimmest at 15.9 inches wide, while the RTIC is wider at 18.19 inches. Our roundup of the best 45 qt coolers for the money includes real-world vehicle-fit notes for each model. For height, the Coleman stands tallest at 17.17 inches, so check for overhead clearance if stowing under a tonneau cover or a low deck.
How the Weight Adds Up
The empty cooler itself weighs between 19.8 lbs (Coleman) and 29.5 lbs (RTIC). Once you add 20 lbs of ice and 40 lbs of cans and drinks, the total weight lands around 80–90 lbs. Plan for a two-person carry, especially if steps or uneven ground are involved. The roto-molded models (RTIC, YETI) weigh more because of their thicker walls and better insulation, but that insulation gives you the longer ice retention.