Xuzhou Muzhishi Crafts Co., Ltd. delivers professional-grade Square Glass Jam Jars With Colorful Lids engineered for maximum efficiency and brand appeal. Since 2005, our factory has been making high-quality products for more than 20 years. It has 10 glass furnaces that can make up to 1 million units per day. These containers come in three sizes: 250ml, 500ml, and 750ml. They are made of high-clarity flint glass and have TPU-lined lids that are safe for food. Because we have streamlined our production, we can send out samples in 3–5 days and finish mass production 30 days after approval. Each jar goes through strict thermal shock tests to make sure it can handle temperature differences of up to 42°C. This makes sure it works well during hot-fill processing.
Customers can really benefit from the cubic shape of our jars when it comes to logistics. Compared to round containers, the flat-sided shape makes pallets about 25% more efficient, which directly lowers your shipping costs and warehouse space needs. The strengthened corners make it less likely that the package will break during shipping, and the multi-surface shape gives you four different labelling options to tell a full story about the product.
Your brand benefits from enhanced shelf impact. Consumers naturally gravitate toward the distinctive square silhouette in crowded retail environments. The stable base prevents rolling incidents on production lines, reducing downtime and product loss during automated capping processes.
| Parameter | Details |
|---|---|
| Material | Lead-free glass with food-grade colorful lids |
| Capacity Options | 250ml, 500ml, 750ml |
| Shape | Square design for optimal space utilization |
| Lid Colors | Customizable vibrant colors available |
| Mouth Diameter | 5.8cm (all sizes) |
| Jar Heights | 7.9cm (250ml), 11.1cm (500ml), 13.2cm (750ml) |
| Jar Diameters | 8cm (250ml), 8.8cm (500ml), 9.7cm (750ml) |
| Weights | 252.1g (250ml), 300.7g (500ml), 434.5g (750ml) |
| Sealing Type | Screw cap with airtight seal |
| Model Numbers | FP-C-016, FP-C-017, FP-C-018 |
| Origin | Jiangsu, China |
Our bright lids turn useful packaging into marketing tools. Colour-coding systems are easy to use—red for strawberry jam, orange for marmalade, and purple for blueberry—and help customers make decisions at the point of sale. Each lid is put through UV stability tests to make sure that the colours stay intact even after being exposed to long periods of LED store lighting.
Food-safe organic lacquers that meet FDA and EU 10/2011 standards are used in the finishing process. Testing for cross-hatch bonding makes sure that the paint doesn't move when it's stored in a wet area. Its plastisol lining makes vacuum seals that are necessary to keep high-viscosity foods fresh and protects against acidic corrosion from fruit-based contents.

Artisan Food Producers: Small-batch jam makers leverage the square format for premium positioning. The transparent walls showcase natural fruit colors and chunky textures that communicate quality. Four-sided labeling accommodates detailed ingredient lists, origin stories, and serving suggestions without compromising visual appeal.
Commercial Manufacturing: High-volume operations benefit from automated compatibility. Our dimensional tolerance verification using digital calipers guarantees seamless integration with high-speed capping machinery. The consistent geometry eliminates jamming issues common with irregular containers.
Hospitality and Gift Markets: Hotels utilize these Square Glass Jam Jars With Colorful Lids for breakfast buffet presentations and in-room amenities. The professional appearance withstands frequent industrial dishwashing cycles. Gift box manufacturers appreciate the interlocking capabilities that create stunning presentation sets for e-commerce shipping.
Every batch undergoes comprehensive testing protocols before shipment. Vertical load strength tests confirm stackability in automated warehouse systems supporting weights up to 50kg per pallet layer. Thermal shock analysis simulates real-world hot-fill conditions at 85°C+ to prevent catastrophic fracture during your production process.
Vacuum retention testing measures gasket integrity by monitoring mbar loss over 24-hour periods. This ensures your products maintain freshness throughout their entire shelf life. Our commitment to zero-defect manufacturing is backed by complete traceability documentation and 24-hour after-sales response.


Transform standard containers into signature packaging through our comprehensive customization services. Choose from hot stamping for metallic accents, frosting for tactile elegance, or inside engraving for permanent branding. Our 3D printing support enables rapid prototyping of complex structural modifications.
Work directly with your dedicated account manager to develop custom Pantone-matched lid colors. Standard color sampling requires 15–21 days for technical perfection. We support logo application through screen printing, embossed labels, or adhesive stickers tailored to your brand guidelines and budget parameters.

Our integrated export system simplifies international procurement. With self-operated import/export credentials, we manage customs clearance, inspection documentation, and multimodal transportation arrangements. You receive complete commercial invoices, packing lists, and certificates of origin formatted for expedited processing in your destination country.
Choose from sea freight for cost-effective bulk orders or air transport for urgent replenishments. Our partnerships with local suppliers deliver 10–15% lower raw material costs, savings we pass directly to you through competitive pricing without compromising quality standards.
Q: Can these jars handle traditional water bath canning methods?
A: Yes, our soda-lime glass construction supports water bath canning when heat is applied gradually. The reinforced corners distribute thermal stress evenly, preventing fracture during processing.
Q: Are the colorful lids safe for acidic foods?
A: Absolutely. Our lids feature BPA-NI (BPA Non-Intent) liners and acid-resistant coatings tested against jam pH levels ranging from 2.8 to 3.5 without degradation.
Q: How does square packaging improve my bottom line?
A: The space-efficient design reduces per-unit shipping costs by maximizing container loads. Retail shelf optimization allows 30% more product placement per linear foot compared to round jars.
Q: What minimum order quantity do you require?
A: We accommodate both small artisan batches and commercial volumes. Contact us to discuss your specific quantity requirements and pricing tiers.
Q: Can I receive samples before committing to production?
A: We provide free samples for quality evaluation. Sample requests are fulfilled within 3–5 days to accelerate your decision-making process.
Ready to elevate your product presentation with Square Glass Jam Jars With Colorful Lids? Our team stands ready to transform your packaging vision into reality. Contact long@muzhishi.com to discuss customization options, request samples, or obtain detailed quotations tailored to your volume requirements.
Our customers’ satisfaction speaks for our quality — contact us to experience the same reliable service.