Yes. For small, non-fragile and suitable contents, you can use a tear-resistant plastic shipping film or a dimensionally stable shipping bag made of cardboard or paper.
As a plastic packaging option, for example the original packaging from an online retailer or a comparably tear-resistant shipping film is suitable. Shipping bags made of cardboard or paper may be a maximum of C4 format. They should be stable, undamaged, and as flat as possible. Simple envelopes are not suitable.
Fragile items as well as contents with sharp, pointed, or protruding parts must be placed in a sturdy box.
Also make sure the packaging fully encloses the contents, is securely closed, and remains as cuboid as possible. Remove any old barcodes and shipping labels completely or make them unreadable. The new shipping label must be clearly visible and securely attached to the largest surface.