Si Jacobson Manufacturing

SI Jacobson is a U.S-based manufacturer and global partner specializing in custom sewing, injection molding, and thermoforming solutions. For more than nine decades, we have helped companies in various industries, including automotive, medical and healthcare, military and defense, electronics and technology, industrial tools and equipment, consumer care, and outdoor sporting goods, bring innovative products to market with speed, quality, and precision. What sets SI Jacobson apart is our end-to-end approach. From the earliest stages of design, research, and CAD engineering through prototyping, sampling, and bulk production, our team ensures that every project is optimized for cost, efficiency, and performance. With both domestic manufacturing in Lake Forest, Illinois, and trusted international production partners, we offer the flexibility to scale while meeting the diverse needs of our clients. Our domestic and international warehousing and fulfillment capabilities further support just-in-time delivery and supply chain stability. Sustainability is at the core of who we are. SI Jacobson integrates eco-friendly materials, lean manufacturing practices, and energy-efficient processes to reduce waste and environmental impact while helping clients achieve their own sustainability goals. Our products comply with stringent standards, including ISO, RoHS, and Prop 65, and we offer whole Berry Amendment–compliant manufacturing for defense and government contracts. Every solution we deliver is built on the foundation of quality, collaboration, and trust. Whether creating rugged military gear, sterile medical packaging, protective electronics cases, or durable automotive tool kits, our goal is to design and manufacture products that make our clients more competitive, resilient, and future-focused. With a track record of delivering reliable, cost-effective solutions, SI Jacobson remains the manufacturing partner of choice for leading companies across the United States.