Design-Led Custom Manufacturing
Built on Legacy, Driven by Partnership
Every project begins with people. For over 90 years, we’ve worked alongside clients to transform complex ideas into practical, high-performing products. From custom sewn-goods and molded foam to advanced plastics and composite material solutions, we combine creative thinking with disciplined execution.
Collaboration is at the heart of our process. Whether you’re developing something entirely new or scaling something proven, we start by listening — to your goals, your constraints, and the realities your product will face in the field. Together, we help brands bring products to market faster, smarter, and with confidence.
Our Work
Every product begins with a proven process. Our team combines design insight, material expertise, and manufacturing discipline to deliver custom solutions that perform in real-world conditions — across soft goods, thermoformed packaging, injection-molded plastics, and integrated assemblies.
Our Partners
Frequently Asked Questions
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SI Jacobson is a design-led custom manufacturer specializing in carrying cases, protective packaging, soft goods, thermoformed components, and injection-molded products. We partner with brands across medical, defense, automotive, electronics, industrial, and consumer markets to bring products from concept to production.
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SI Jacobson was founded in 1934 and has over 90 years of continuous manufacturing experience. We operate a full-scale production facility in Lake Forest, Illinois, complemented by a managed international manufacturing network across Asia.
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We serve six primary industries: electronics and technology, industrial tools and equipment, automotive and mobility, military and defense, medical and healthcare, and consumer and outdoor products. Each industry vertical has a dedicated team with specialized expertise.
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Our headquarters and primary manufacturing facility are located at 13950 W Business Center Dr, Lake Forest, Illinois 60045. We also manage international production through trusted partners in China, Cambodia, Vietnam, and Indonesia.
Every Partnership Starts with a Conversation
Whether you've seen something in one of our posts, read an article that resonated, or have a project taking shape in your mind—we'd like to hear about it. Before we propose solutions, we want to understand your challenge. Share some details below and we'll follow up to learn more. No pitch, just a conversation.