The best alternatives to Pakible are Arka, Shyp, and Georgette Packaging. If these 3 options don't work for you, we've listed a few more alternatives below.
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Die Cut Templates is a perfect for customising and downloading packaging dielines online. We are a small team of Software Engineers and Packaging Designers working on online CAD solution to help packaging design problems such as dielines, 3D Mockup and nesting