Toiletries and Medical Supplies: Always carry toilet paper with you where ever you go. It is the main essential item to take. Most public (and many private) places do not have it. You can get most major brands of personal care products in Russia now. Don't worry about running out of things, you will be able to buy more.
Luggage and bags:
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Clothing/Shoes/Weather Gear: spare underwear
Toiletries and Medical Supplies: toilet paper
Photo Equipment: camera or video a must
Camping/Beach/Outdoor Gear: somthing warm
Miscellaneous: sick bag