If you don't already know or can guess,  you probably don't want to know...

Best to dump it in the nearest public rubbish bin,

its probably not advisable to keep around the house.

Synthetic cannabis or something similar.

Brain surgery material.

wellygary:

 

If you don't already know or can guess,  you probably don't want to know...

 

Best to dump it in the nearest public rubbish bin,

 

its probably not advisable to keep around the house.

 

Done....

Ketracel-white 

DarthKermit:

 

Synthetic cannabis or something similar.

 

In which case, the packaging follows the government standards for tobacco products...

Advise the police?

DaveB:

 

Advise the police?

 

Regarding a ziploc bag? Not much they would do for an item that can be sold anywhere legally.