Onion bags

The most common materials are High-Density Polyethylene (HDPE) and Polypropylene (PP). For onion storage, Leno mesh bags are the industry standard because they provide superior ventilation, which prevents moisture buildup and rot. Ensure the material is UV-stabilized if the bags will be exposed to sunlight during transport or outdoor storage to prevent the plastic from becoming brittle.

Onion bags are typically categorized by weight capacity: 5kg, 10kg, 25kg, and 50kg. You must verify the mesh density and denier (yarn thickness) to ensure the bag can handle the weight without tearing. For heavy-duty 50kg applications, look for reinforced side seams and a circular woven base to prevent bottom bursts during stacking.

Since these bags come into direct contact with produce, they must be Food Grade Certified. Ensure the supplier provides FDA (U.S.) or EC 1935/2004 (EU) compliance certificates. Additionally, check for BPA-free materials and ensure that the dyes used for coloring (usually red, orange, or yellow) are non-toxic and do not bleed onto the produce.

Prioritize bags with integrated drawstrings (poly-tape or PP cord) for quick and secure manual closing. For automated packing lines, you should request bags on rolls (header bags). Another critical feature is a printed label band (white film) in the middle of the mesh, which allows for easy branding and barcode printing.

Request a pre-shipment inspection (PSI) to verify the tensile strength and actual dimensions. A common risk in this industry is 'under-gauging,' where suppliers reduce the weight of the mesh to save costs. Use Made-in-China.com's Secured Trading services to ensure payment is only released after quality verification.

Negotiate based on weight per bag (grams) rather than just unit price, as this determines the material cost. For large-scale buyers, aim for volume-based discounts; typically, orders exceeding 100,000 units can see a price reduction of 10-15%. Also, negotiate for customized label printing to be included in the unit price for high-volume orders.

Onion bags are lightweight but bulky. To optimize shipping costs, ensure the supplier uses high-compression hydraulic baling presses to pack the bags. This maximizes the number of units per container. For North American or European routes, clarify the Incoterms (FOB vs. CIF); given current freight volatility, FOB is often preferred for buyers who have established relationships with freight forwarders.

Always verify if the supplier is an Audited Supplier on Made-in-China.com, which confirms their factory existence and production capacity. Avoid direct wire transfers to personal accounts; use official corporate bank accounts or the platform's secure payment gateway to protect your capital against fraud.