Luggage and bags:
As less bags as possible as you'll be tempted to walk a lot...
Clothing/Shoes/Weather Gear: Usually, on the western coast of Norway is raining but the temperature is not so low (it could be between 7-15 deg. C in May or even 20).
Try to find a jacket (and some trousers) as "water proof" as possible and you don't need more than a normal pullover or a shirt under it.
It could be a bit colder in the mountains but you don't need to take your underpants to survive :)
Anyway, as far as I know, the driest period on the western Norwegian coast is from March to June.
Enjoy your trip and don't forget to share with us your impressions ;)
Toiletries and Medical Supplies: Keep your card with you and you'll find here everything you need.
Photo Equipment: You really need a good camera.
The "reflections" in the steep fjords are amazing.
And, if you are lucky enough to get at least a sunny day, you’ll need a big memory card too…
Luggage and bags:
If you're planning to go on a hike or long walk, women, take a waterproof bag.
Clothing/Shoes/Weather Gear: Good walking shoes. Some of the streets are steep AND cobbled so no slippery shoes.
The paths up Floyen are wild so hiking or running shoes.
The weather does not seem to be particularly windy, so I would say you can carry with yo a cheap umbrella. It won't be destroyed.
Waterproof clothing is indispensable for longer walks.
As a Bergen citizen over 30 years, and a traveller myself, I want to point out that the weather in Bergen isn't "that bad". ;)
At http://www.bbc.co.uk/weather/world/city_guides/city.shtml?tt=TT004060, you'll see that the main chunk of rain comes in autumn, with nearly twice as much rain as "normal" months. Also, note that May and June aren't that bad. In fact, there's less rain in these months than in "normal" european cities like for instance Munich.
Do absolutely not pack an umbrella. ;) They take up a lot of space, and you're not even sure to have rain. In need, buy one in a kiosk, they cost about $8 or €6.. as for a "sturdy" umbrella, don't - unless it's a souvenir. Bergen does not have much wind in summer. And tropical style rain is very very rare, the normal pattern (in autumn) is a steady trickle that lasts all day and all night.
Bergen is an excellent town. And please, if you're going in summer, don't believe the hype about the weather.. :) Come to Bergen, drop the umbrella.
A sturdy umbrella and a waterproof coat are vital if you visit Bergen because it's very like to rain heavily at least some of the time you're there.
If you visit in winter, warm clothes are essential because it can get bitterly cold, especially if you plan to take a fjord trip or venture anywhere inland.
if you go on winter, a scarf, a hat and gloves are 'compulsory'
Photo Equipment: it cannot be very bright some days better getting few more sensitive films.
PS: be sure to carry them with you form the country you are from because the cheapest are 30NOK for a 24 exposures.
Miscellaneous: Get an umbrella, in Bergen it does rain
Luggage and bags:
It will great if your bag is made of water-proof material or if you got a rain cover for your bag coz it rains & rains & rains in Bergen.
Clothing/Shoes/Weather Gear: You will most probably need a poncho or a water resistant jacket with a hood to keep yourself dry.
Miscellaneous: Don't forget an umbrella or a rain coat, because Bergen is known for its huge amount of rainfall every year!! But if you do forget, don't worry... they have vending machines with umbrellas situated around in the city centre;-)
Do not bring along your favourite umbrella. The wind will blow it into pieces...
Buy an inexpensive one for each day of your stay...