Let's look at the material

ice cream foam box: I've never seen a person making bag out of foam before. This is probably because of foam's property which break easily if bent. Because no one have used it before, I thought of slicing foam and make some new arrangement to it to make the foam bag more flexible. However, it would still break easily it pushed in a wrong way. Also, it is very hard to attach them to one another as a big needle would break it and a small one can only insert small thread. After looking at foam, I thought of the idea of using sponge as a bag. However, I don't have any old one at home...
dust roller box inside: The box already have a handle within itself. The form of it is already a bag,, so I couldn't make any change to it that could make it function better as a bag.
ice cream bag: Although it is flexible and nice looking but the idea of using ice cream bag isn't new. Therefore, I decide not to use it.
magazine: There are many parts of the magazine that can be used like the cover, the spine, and magazine paper. A stack of magazine paper can be a good way to make a bag as it is quite string and flexible. Spine is also a good one although it is quite hard and non flexible.
snack box: Snack boxes are quite hard just like a hard paper. It is slightly waterproof.
facial cream box: facial cream box are usually small therefore, there must be a combination of a lot of boxes to make a bag. These boxes come in different kind of colors, some are shiny and some are simply white. Therefore, combination of different colors can catch people's eyes.

growing bracelet: Growing bracelets are used a lot in concert and parties. Therefore, there are many of them wasted in a party. People usually throw them away after using them because they can no longer glow in the dark. The colors are pink, yellow, orange, and green. Because I am not sure about the chemical inside each tube, I don't think I should mess with them.
plastic bag: There are tons of plastic bag wasted in Thailand each day, some people throw them away and some keep them for other usage. However, they are not beautiful so people don't like carrying them around. The plastic bags are already made for carrying things so applying into a bag would not be hard.
marker bag: Marker packs are not found often as some people don't use them. However, it has a good flexible property that can turn into a bag.

scented gel package: In order to use make a scented gel pack into a bag, it has to be disassemble. There are many parts inside that have to be cut off in order to make a space for bag. Also, the plastic is quite thick so it hard to deal with.
plastic for food: This kind of plastic is quiet flexible but can also break if bend too much. I think that it is a good plastic to be made into a bag. Furthermore, there are usually pattern at the bottom and on top of them so bag with pattern can be made with it.
food cup:I think that the bottom part of cups and the lid can be used to make bag. The middle part that a rod shape and is very hard to bend and it not very applicable.
bath curtain: Bath curtain can be a good material to make a bag as it is strong and flexible. I think that the top part of curtains that contain hole that is usually put into loops can be a part to show that it is a used material.

elastic ban: Elastic ban are usually flexible but if it is exposed to sunlight too much, it will break. Therefore, it is not a good material for a bag that would be exposed to sun. Also, it one break them the whole bag is not able to function at all because the elastic ban will scatter everywhere.
slip: Buying slip are small and usually thrown away when looked at once. It is one of the object that is wasted often. Anyhow, it is torn easily and is not strong. Taking note on it is the only option to used it further. Making it into a bag would be a good idea.
fruits foam: Fruits are usually covered by this flexible weak foam to reduce the damage from getting a bad hit. Because it is weak, it can only be used to cover something but not hold it.
tissue center: Tissue center is just a hard paper rolled. It is quite strong but not so flexible.
candy package: It has the same property as a ice cream bag but it is smaller and therefore harder to deal with.