you need tell us:
1.Material: If you have no idea, tell me what you're going to pack. I will give you some suggestion.
2.Size: You can buy a similar product, then test it (lenth/width/depth)
3.Printing: Art work should be send together. If you haven't finish it, we provide free design for you.
Just send me your logo and text.
4.Quantity:More you need , price will be more cheaper
b:About sample:
1.Free sample: we provide you free sample which is similar to your material, size and thickness