I think that there are huge differences in the sleeping bags. If it is down (down is the feathers of eg. swan) or synthetic fibre, the down is more expensive and goes into smaller room. One should try the sleeping bag in the shop and check if one can turn inside of it, this is for the comfort. You probably find that the sleeping bag with the synthetic fiber is huge for the conditions of Finland. Also the tent for all the four seasons for one person is expensive (400e, but it may be I was robbed). It is important what is the comfort temperature of the sleeping bag (=lowest temperature when one can sleep in it). I bought a sleeping bag with comfort 0 that is made from down, it costed 329e but it may be I was robbed again. In addition you need a spirit burner, and a sleeping mat (when you go down sleeping in a sleeping bag your weight makes the sleeping bag very thin under you and you get cold unless you have a sleeping mat, this is the problem especially with down sleeping bags). In addition there are differences in the backpacks, you should check with a little bottle of water in the shop if the fabric is waterproof. I have a backpack that has a metal frame and takes 60 litres plus one can attach the sleeping bag to the bottom of it and eg. the sleeping mat above it. The point is that the belt of the backpack should be tightened so that the weight is on your hips, not on your shoulders.
I thought to give more information about this survival when I get some. The problem is that the backpack gets very heavy easily and that the quality of sleep is very poor even when the comfort temperature matches.
Then little advise on folding the tent and the sleeping bag. First one would think that one should fold it (the tent or the sleeping bag) into so small form that it can be put into the bag of it. But there is a better way for both: The sleeping bag can be pushed into the bag of it little by little. Also it is fast to fold the tent into the bag of it using the pole that comes with it. For 1 person tent there is only one pole that can be disassembled into a short but slightly thick stick. Then it is a good idea to use this stick to wrap the tent around it, and then it can be easily put into the bag of the tent.
It is also a good idea to ask (in buying the tent) the shopkeeper to show how it is pitched, at least to fasten the inner tent to the outer tent which can be difficult for the first time. The tent costs about 450e so you can ask for little service.
Then you need waterproof clothes. Nowadays they hardly sell anymore usual rainwear, it is nowadays Gore-Tex fabric that lets your sweat through it but holds water on the outside. I bought such and it was 140e 1.1.2006. I have actually Finnish counterpart of it that is called DrymaxX (Halti). They really work. Buy large enough so that you can have many layers of clothes under it, but the trouser legs do not end below your feet (I have stickers that can be tightened, so that I don't step on my trouser legs). I have slightly too big hood that falls on my eyes unless I have a peaked cap. Also it is good to have zippers in your pockets. Also it should have the possibility to wear a belt so that the trousers keep up. Then you should have rubber boots and socks of wool, even in the summer. The socks keep the warm outside as well as cold outside, at least your feet do not get awfully hot as one might think.
Also there are waterproof covers for a backpack, eg. 85 litres. The backpack however should be waterproof.
In Finland in summertime the lowest temperature of the day and night is a little before the sunrise. Also the highest temperature is on the afternoon. They differ in the summer in Finland about 10 degrees of Celsius. You should find a good almanac that has the average temperatures and the time of the sun rise and set (in Finland such is provided by the university).
It is important in the winter that one does not sweat one's clothes. Therefore one should use many layers of clothes that can be easily tuned. It is difficult to dry clothes in the winter, one should try to light a camp fire. Also one needs a kind of shovel, I have been recommended to use a plate of wood or plastic, in addition one can put two holes for eg. thumbs in it so that it would be easier to use. Another way is to step on the snow and spread branches of a spruce under the tent, but be careful not to rip your tent. Below the tent one can also spread two sleeping mats (on the branches probably) so that the tent is not ripped
It may be that the synthetic fibre sleeping bags have a broader range of temperatures when it is comfortable. I have one such that works as low as -20 Celsius but it declares that it should be comfortable as high as +10. But as I said my expertise is 4 nights in the woods, this has to be checked.