Shrink Wrap

Shrink wrap is a polymer plastic film that, when heated, shrinks tightly around whatever it covers. In logistics and fulfillment, it is used to bundle products together, secure items to pallets, protect goods from dust and moisture, and create tamper-evident packaging. The material is typically polyolefin or PVC (polyvinyl chloride) film, available in thicknesses from 45 gauge to 100 gauge, with thicker films providing greater puncture resistance and durability.

Shrink Wrap vs. Stretch Wrap

These two films serve different purposes, and the terms are not interchangeable. Shrink wrap requires heat to activate. The film is loosely placed around a product or group of products, and a heat gun, heat tunnel, or shrink-wrap machine applies heat that causes the film to contract and conform tightly to the surface. The result is a smooth, form-fitting layer that looks professional and resists tampering.

Stretch wrap (also called stretch film or pallet wrap) is applied by pulling and stretching the film around an object, typically a loaded pallet. It does not require heat. The film’s elasticity and cling properties hold it in place. Stretch wrap is the standard method for securing cartons on a pallet for shipment, while shrink wrap is used for individual product packaging and bundling.

Applications in FBA Prep

Amazon requires shrink wrap on several types of FBA inventory. Multi-pack items (a set of three soap bars sold as one unit, for example) must be enclosed in shrink wrap or a polybag so that Amazon’s fulfillment center treats them as a single sellable unit. Without shrink wrapping, the individual items could be separated during warehouse handling and sold individually, creating inventory discrepancies and customer complaints.

Products with loose parts or accessories also benefit from shrink wrapping. A kitchen gadget that comes with a detachable blade guard and a recipe booklet should be shrink-wrapped so that all components stay together from the prep center through Amazon’s warehouse to the customer’s door.

Polybag alternatives exist for some of these use cases, but shrink wrap provides a tighter, more professional appearance and is often preferred for retail-ready products. Amazon accepts both shrink wrap and polybags for multi-component items, provided the packaging meets the suffocation warning requirements (any poly packaging with an opening of 5 inches or more must display a suffocation warning).

Equipment and Process

Small-volume operations can shrink wrap using a handheld heat gun ($30 to $80) and pre-cut shrink bags. The operator places the product in a bag, seals the open end with a heat sealer, and applies heat with the gun until the film contracts. This method works for 50 to 200 units per day but becomes impractical at higher volumes due to the time per unit (30 to 60 seconds each).

Mid-volume operations (200 to 2,000 units per day) use L-bar sealers paired with heat tunnels. The operator places the product on a film roll, the L-bar sealer cuts and seals the film on two sides, and the wrapped product passes through a heat tunnel that shrinks the film uniformly. Throughput is 5 to 15 seconds per unit depending on product size. Equipment costs range from $1,500 to $5,000 for the sealer and tunnel combination.

High-volume operations (over 2,000 units per day) use fully automated shrink-wrapping systems with conveyor-fed sealers and tunnels. These systems handle 20 to 40 units per minute and cost $8,000 to $25,000 depending on speed and automation level.

Material Selection

Polyolefin film is the most common choice for product-level shrink wrapping. It is FDA-approved for direct food contact, produces minimal odor when heated, and provides a clear, glossy finish. Standard thicknesses are 60 to 75 gauge for lightweight items and 75 to 100 gauge for heavier or sharp-edged products.

PVC film is less expensive but produces a slight odor when heated and is not food-safe. It works well for non-food items like books, DVDs, and boxed products. Cross-linked polyolefin films offer superior puncture resistance for irregularly shaped items with protruding edges.

Prep centers like MeisterPrep maintain multiple film types and gauges to match the packaging requirements of different product categories. Using the wrong film thickness results in either an unprofessional, wrinkled finish (film too thick for the product) or tears and punctures (film too thin for the product’s shape and weight).