Bags for onion manufacturers

Onion bags are primarily made from Polypropylene (PP) or High-Density Polyethylene (HDPE). For B2B sourcing, you must prioritize Leno weave (mesh) structures because they provide maximum ventilation, which is critical to prevent moisture buildup and fungal growth. Ensure the material is UV-stabilized if the onions will be stored in areas with sunlight exposure to prevent the plastic from becoming brittle.

Standard capacities range from 5kg to 50kg. For retail distribution, 5kg and 10kg bags are common, while 25kg and 50kg are industry standards for wholesale. You should verify the denier (linear mass density) of the plastic tapes; a higher denier indicates a stronger mesh capable of withstanding the rigors of mechanical loading and stacking.

Since onions are food items, the bags must meet Food Grade Certification. Ensure the supplier provides FDA (US) or EC 1935/2004 (EU) compliance documents. Additionally, check for heavy metal content limits in the dyes used for the mesh (commonly red, orange, or yellow) to ensure they do not leach into the produce.

Request information on the bottom seam strength—double-stitched bottoms are preferred for heavy loads. For the top closure, specify whether you require a drawstring (poly-tape or cotton) or a plain top for machine sewing. A high-quality drawstring should be securely threaded to prevent slipping during manual handling.

Always request a pre-shipment inspection (PSI). You should specifically ask the inspector to perform a load-drop test (dropping a filled bag from 1 meter) to check for seam bursts. Using Made-in-China.com's Secured Trading Service can also protect your payment until the shipping documents are verified.

Negotiate based on weight per bag (grams) rather than just unit price, as some suppliers reduce costs by thinning the mesh. Aim for a volume-based discount; for orders exceeding 100,000 units (a full 20ft container), you can typically negotiate a 5-10% price reduction compared to LCL (Less than Container Load) orders.

Onion bags are lightweight but bulky. To optimize shipping costs, ensure the supplier uses high-pressure hydraulic baling presses to pack the bags. This maximizes the number of units per container. Confirm the Incoterms; for large volumes, FOB (Free On Board) is usually more cost-effective as it allows you to control the ocean freight through your own forwarder.

Be aware of Plastic Tax regulations in regions like the UK and EU. Some countries impose levies on packaging with less than 30% recycled content. Ask your supplier if they can provide GRS (Global Recycled Standard) certified materials to avoid these additional costs and align with sustainability mandates.