37 x 37 x 52 in bulk bag
A 37 x 37 x 52 in bulk bag is a common baffled size: 71,188 cubic inches, 41.2 cubic feet or about 1,167 litres of box, and the baffles keep it square so a fill gets closer to that number than an open bag can. It suits resin, sugar and food or chemical powders shipped where cube matters, most often at 2,000 to 2,500 lb SWL.
- Footprint
- 37 x 37 in
- Body height
- 52 in
- Box volume
- 71,188 cu in = 41.2 cu ft = 1,167 L
- Method
- 37 x 37 x 52 = 71,188 cu in, divided by 1,728 cu in per cu ft
Fill weight if filled to the box volume
Each row multiplies 41.2 cu ft by an assumed typical bulk density. A filled bag rounds out and settles, so the real fill differs: use your product's data sheet. Never fill past the SWL on the label.
| Product (assumed density) | Weight at 41.2 cu ft | Lightest common SWL that covers it |
|---|---|---|
| Plastic resin pellets (34 lb/cu ft) | 1,401 lb | 1,500 lb |
| Wheat flour (36 lb/cu ft) | 1,483 lb | 1,500 lb |
| Seed corn (45 lb/cu ft) | 1,854 lb | 2,000 lb |
| Granulated sugar (50 lb/cu ft) | 2,060 lb | 2,200 lb |
| Granular fertilizer (60 lb/cu ft) | 2,472 lb | 2,500 lb |
| Portland cement (90 lb/cu ft) | 3,708 lb | 4,000 lb |
| Gravel (95 lb/cu ft) | 3,914 lb | 4,000 lb |
| Dry sand (100 lb/cu ft) | 4,120 lb | 4,400 lb |
On the pallet
| Pallet | Room per side, empty footprint |
|---|---|
| 40 x 40 in | 1.5 in across, 1.5 in along |
| 48 x 40 in | 1.5 in across, 5.5 in along |
| 48 x 48 in | 5.5 in across, 5.5 in along |
Filled bags on a trailer floor
| Fill per bag | Bags, single stacked |
|---|---|
| 1,000 lb | 34 (2 across x 17 rows = 34 by floor; 44 by weight) |
| 2,000 lb | 22 (2 across x 17 rows = 34 by floor; 22 by weight) |
| 3,000 lb | 14 (2 across x 17 rows = 34 by floor; 14 by weight) |
Assumes a 53 ft dry van 630 x 100 in inside and a 44,000 lb payload; your carrier's limits and the bulge of a filled bag decide.
Why this size is usually baffled
Baffles are fabric panels sewn across the inside corners of the bag. Product flows through openings in them, and the panels pull against the walls so the bag fills square instead of round. A 37 in baffled bag stands like a box, which is the point: it uses the pallet and the trailer floor the way a carton would, and it sits tighter in a warehouse.
37 in is about as wide as you can go on a 40 x 40 in pallet with room to spare: 1.5 in per side on the sewn size. A round, unbaffled bag of that width would bulge past the pallet edge when full. A baffled one holds closer to its sewn width, so the 1.5 in has a chance of surviving the fill.
There is a cost in fabric and sewing: each baffle means extra panels and extra seams inside the bag. On a product where a square shape gets more bags into a warehouse bay or a shipping container, that cost tends to pay back. On aggregate in an open yard, it seldom does.
Food, nutraceutical and pharmaceutical ingredient makers like baffled bags for a cleaner reason as well: a square bag stands up on its own in a discharge station, its liner stays smooth, and less fabric folds into corners where powder can hide. Those bags are new, lined and made for food contact.
41.2 cubic feet that stays square
37 x 37 x 52 = 71,188 cubic inches; / 1,728 = 41.2 cubic feet; x 28.3 = about 1,167 litres. The baffle panels take a sliver of that, and the top still crowns, but a baffled bag fills nearer its box than any open bag of the same dimensions.
At our assumed densities: pellets at 34 lb per cubic foot, 1,401 lb; flour at 36 lb, 1,483 lb; seed corn at 45 lb, 1,854 lb; sugar at 50 lb, 2,060 lb; granular fertilizer at 60 lb, 2,472 lb. Sugar wants a 2,200 lb bag and fertilizer a 2,500 lb one. Pellets and flour fit under 1,500 lb, which is why resin shippers who want a heavier bag move to a taller size or a 41 in footprint.
Cement at 90 lb would be 3,708 lb and sand at 100 lb 4,120 lb at box volume. Baffles add sewing, and they earn it on products where floor space and warehouse cube cost money, more than on dense aggregate that fills any shape to its rating.
Pallet, rack and floor
In an assumed 53 ft van, 100 in of width takes two 37 in bags across with 26 in left over, and 630 in takes 17 rows, since 630 / 37 = 17.03. That is 34 floor spots. At 2,060 lb of sugar per bag, 44,000 / 2,060 = 21 bags; at 1,401 lb of pellets, 34 x 1,401 = 47,634 lb is more than the payload, so 44,000 / 1,401 = 31 bags.
Square bags sit snug against each other, which helps when they are block-stowed or stacked. They are still bags: check the label for a stacking rating before one goes on another, and never stack a bag that leans.
Containers are where square bags show their worth. A round bag leaves dead space in every corner of the box; a baffled one packs closer to wall to wall, which is why exporters of resin and food powders ask for baffles so often.
In a warehouse the gain shows up in bays and aisles. An unbaffled bag sewn 37 in wide swells past that when full, so a row of ten takes noticeably more floor than ten baffled bags standing near their sewn width. Across a building, the difference adds up to whole rows of storage.
Ordering a baffled 37
Fine, cohesive powders may not pass the baffle openings freely, so the product matters as much as the size. Tell us what goes in and we check it against the bag maker's notes.
Discharge is the other half. A baffled bag empties through its spout like any other, but product can hang up behind the panels near the end; a discharger with paddles that massage the lower corners finishes the job.
Inspecting a baffled bag means looking inside it as well as out. A baffle seam that has let go makes the bag fill round on one side and lean, and a loose panel can block the spout. Bags with torn baffles are set aside, not filled.
- Say baffled: an open 37 x 37 x 52 is a different bag
- Product and its bulk density, so flow through the baffle openings can be checked
- SWL of 2,000, 2,200 or 2,500 lb, and 5:1 or 6:1
- Top: spout for closed filling, duffle for a wide inlet
- Bottom: spout with a closure, or flat
- Liner: one made to fit a baffled bag, if the product needs it
Questions
What is a baffled 37 x 37 x 52 bag?
An FIBC with fabric baffles sewn across its inside corners, so it fills square. The box is 41.2 cubic feet, and the baffles let a fill get close to it.
How much does a 37 x 37 x 52 bag hold?
At our assumed densities, 1,401 lb of resin pellets, 2,060 lb of sugar or 2,472 lb of granular fertilizer at box volume. The SWL on the label caps the fill.
Does a 37 in bag fit a 40 x 40 pallet?
On the sewn size it leaves 1.5 in per side. A baffled bag holds that margin better than an open one, but measure a filled bag before you plan racking or wrapping.
Request 37 x 37 x 52 in bags
Add the top, the bottom, the SWL and the count. We confirm the spec and plan the load to your dock.