Large-format poly bags designed for mattress storage, furniture protection, and oversized item packaging. These 28" x 40" flat poly bags provide reliable protection for mattresses, upholstered furniture, large apparel, bedding, and industrial parts. Manufactured from 100% virgin Low Density Polyethylene (LDPE) resin, these 3 mil bags offer a balance of durability and flexibility for moving, storage, and warehouse applications. The 3 mil thickness provides puncture resistance while maintaining flexibility for wrapping irregular shapes. LDPE construction delivers superior clarity compared to recycled materials, allowing contents to remain visible during storage or transit. Each bag features either a durable bottom seal or reinforced side weld for consistent strength and leak resistance. Key Benefits: Large 28x40 format fits twin and full mattresses, furniture cushions, and oversized items 3 mil LDPE construction balances durability with cost efficiency Superior clarity for easy content identification FDA-compliant virgin resin safe for direct food contact applications Versatile closure options: heat seal, tie, staple, or tape Specifications: 28" x 40" | 3 mil | LDPE | 100/case | FDA-compliant virgin resin Common Applications: Mattress storage and moving protection, furniture covers for chairs and cushions, bulk apparel and textile packaging, industrial parts and components, warehouse inventory protection, large flat item shipping. What are flat poly bags used for? Flat poly bags are open-top polyethylene bags used for protecting, storing, and shipping a wide variety of products. They can be sealed using heat sealers, twist ties, staples, or tape depending on the application and security requirements. What mil thickness is best for mattress bags? 3 mil bags work well for short-term mattress storage and moving protection. For long-term storage or heavy commercial use, 4-6 mil bags provide added puncture resistance against sharp corners and repeated handling. Can LDPE bags be heat sealed? Yes, LDPE poly bags seal easily with standard impulse heat sealers or hot knife sealers. LDPE's low melting point makes it ideal for creating airtight seals for moisture protection or tamper evidence.