Agricultural paper bags: seed, grain and fertilizer — three different specs

Agricultural paper sacks share a category name but solve three very different problems. Confusing them is the source of most field failures.

Seed bags (10–25 kg)

Premium presentation, often branded with extensive flexo print. Need good print surface (MG or MF kraft, 80–100 g/m²), moderate strength, and reseal capability. Often microperforated for breathability.

Grain sacks (25–50 kg)

Bulk commodity. Strength is everything, cost matters. Standard sack kraft 80–100 g/m², two or three plies, valve-filled. Print is functional, not decorative.

Fertilizer multiwall (25–50 kg)

Fertilizer is hygroscopic and chemically aggressive. Multiwall construction with PE-coated inner ply for moisture barrier, kraft outer plies for strength and print. Wet-strength resins are standard. Compatibility with urea, ammonium and NPK formulations must be tested.

What WeePaper supplies

MG and MF kraft for outer plies, bleached or brown, with documented compatibility for common agro chemistries. Extensible variants for high-speed filling. ISEGA on request for organic agriculture programmes.