Attending the world's hottest parties, strutting down fashion catwalks and gracing the covers of international magazines translates into a lot of traveling for Paris and Nicky Hilton.

And now that the hot-blooded hotel heiresses have launched their own handbag line for Japan-based Samantha Thavasa, it only means more globe-trotting.  One thing's for sure:  Paris, 21, and Nicky, 19, will never have to worry about getting a hotel room.

Favorite luggage brands

Nicky:  I don't like traveling with expensive luggage, especially since my Louis Vuitton duffel was stolen at Boston's Logan Airport.  I was visiting friends from college and I had no clothing.  It was horrible!

Paris:  Enormous black duffel bags.  I have learned to pack more wisely (not less), and I can fit more in a duffel than in a suitcase.

Favorite hotel

N:  The Beverly Hills Hotel in L.A.  My family lived in one of the bungalows for a while while our house was being renovated.  The coffee shop and the Polo Lounge are the best, and I love having lunch by the pool.

P:  The London Hilton.  It's in the middle of it all:  great shopping and fantastic nightlife.

Favorite destination

N:  Los Angeles.  I lived there until I was 12, and there are great restaurants and beaches.

P:  Again, London.

Favorite restaurant

N:  Serafina's in N.Y.  I must go there four times a week.  The food is so fresh and yummy, especially the Focaccia Ligure and the margherita pizza.

P:  Le Cirque.  I had my 21st birthday party there.

N:  I must drink four or five cans of Coke a day.  My boyfriend [MTV veejay Brian McFayden] has the coolest vintage Coca-Cola machine that still works.

P:  I love, love, love frozen hot chocolates and mochaccinos from Serendipity.

Must-haves on the road

N:  I'm lost without my cell phone.  I also always travel with my own Conair hair dryer, Bed Head shampoo, Nars moisturizer, Toni&Tina concealer, and a photo album of my friends and family.

P:  Music, family photos, Estee Lauder Flight Cream, Channel mascara, MAC Lip Glass and my dogs.

Favorite airline

N:  I love Jet Blue;  there's never a line to check in and they have cable on the small TVs.

P:  I fly United a lot, and like most people, I love business class.

Favorite airport

N:  London Heathrow.  I purposely go early to the airport so I can shop before I leave.

P:  Heathrow has amazing duty-free shopping and a great Virgin Atlantic lounge with an arcade and a buffet.

Favorite souvenirs

N:  Sweatshirts and T-shirts from big department stores like Harrod's and Harvey Nichols.

P:  T-shirts.

Most irritation in-transit moment

N:  When Brian and I were in London this summer, a security guard checked our carry-on for, like, a half-hour, and ended up not putting my case of DVDs back in my bag.  I had no movies to watch on the way home, and Brian couldn't use his PlayStation discs, so he wasn't too happy, either.

P:  When my luggage was lost, I just about lost my mind.  It's the worst feeling to wait and wait and nothing comes down the carousel. --Farrah Weinstein (N.Y.Post)