Plastic Bag Ban with effect from 1st June 2019: – tourists, can face very heavy fines for using Plastic bags. Using, manufacture or importation of plastic bags, including garbage bags and shopping bags, is illegal. Convicted offenders, including tourists, can face very heavy fines, imprisonment for up to two years, or both.
Visitors are advised to avoid packing any plastic bags in their suitcases or in carry-on hand luggage before flying to Tanzania. Items purchased at the airport before boarding the aircraft should be removed from plastic bags. Please check hand luggage before disembarking at entry points and any plastic bags should be left in the plane. Similarly, the transparent “zip-lock” plastic bags that some airlines require passengers to use for keeping liquids, cosmetics, toiletries, etc. separately in hand luggage are also not permitted to be brought and should be removed and left on the plane before disembarking.
Full official information: here