Custom Printed Logo Promotional Packaging Polyester Sublimation Drawstring Backpacks Bag. Custom Logo Printing: Supports customized logo via silk screen or heat-transfer printing. Customizable Materials: Available in polyester, nylon, RPET, and other materials upon request. Custom Size Options: Standard size 39x22x29cm or fully customized dimensions available. Eco-friendly & Waterproof: Made with washable, waterproof, and eco-friendly materials. Fast Sample Production: Free samples available with 3-7 days production time. OEM & ODM Services: Full OEM and ODM services accepted for custom promotional orders. 100% Price Match: Guaranteed best market prices for all custom promotional orders. Dedicated Custom Line: Special production line dedicated to handling customized delivery.