to pack one's suitcase is translated 'faire sa valise' in French.
No, you cannot pack a suitcase within a suitcase.
la valise (fem.)
Pack
A wolf pack is "une horde de loups" in French.
Yes, you can pack shampoo in your suitcase as long as it meets the airline's liquid restrictions and is properly sealed to prevent leaks.
sun cream!!!
Yes
Yes, it is generally permissible to pack shampoo in your suitcase for travel, as long as it complies with airline regulations regarding liquid quantities and packaging.
freeze them in a cup.
Sac à dos
un sac a dos
paquet de gomme