Guide
Bulk bags: sizes, weights and delivery
A builders' bulk bag typically holds around 850 kg of sand or aggregate, about half a cubic metre, though weights vary by supplier; bags are lifted off the lorry by its crane and set down on a firm, level spot.
Written by the SK Trade team. Last reviewed 1 November 2026.
How much is in a bag?
Most bulk bags hold around 850 kg, but the exact weight varies by supplier and product. Because sand and aggregates weigh around 1.5 to 1.8 tonnes per cubic metre, a bag is roughly half a cubic metre.
Where can a bag go?
Bags are lifted by the lorry's crane, so the drop point must be within reach of the crane and clear of overhead cables. A full bag is heavy: block paving, soft lawns and thin tarmac can mark or sink.
Keeping it clean
Cover bags to keep sand at a workable moisture content and stop leaves and debris getting in. Use the material from the top down.
Bags or loose loads?
For large quantities, a loose tipped load can work out better if the lorry can reach and there is space to tip. Bags are tidier on small sites.
Related products
Related questions
How much does a bulk bag of sand weigh?
Around 850 kg is typical, but bag weights vary between suppliers. We confirm the weight with your price.
How much ballast for a cubic metre of concrete?
Roughly 2 to 2.2 tonnes of all-in ballast with about 15 bags of cement at a 1:5 mix. Our concrete calculator works out your slab or footing.
Sources
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