CXM started with a “HAMPU” chalk bag. “HAMPU” means sailcloth(canvas) in Japanese.

As that name implies, it was originally used as a sailcloth.

Good breathability and toughness that can be adapted to harsh environments.
It can be said that it is an outdoor material that has been used for a long time.

We uses only high-quality canvas with high density, durability and beautiful texture. It has a strength that can withstand hard use, and It becomes a tasty texture each time it is used. It is such a material that becomes "cool " even if it gets chalk dust and dirt.

We are fascinated by its character, which changes over time, and how it ages to reflect the personality of the user, that's why we use it as a standard material for CXM.

*Following 1.2.3 are the above Hampu.


  1. HAMPU (Unbleached)
  2. Heavy canvas : Cotton100%
    It's woven with thick threads that a strong material with sophisticated waffle texture on the surface.
    It has also a solid thickness and firm.
    It becomes a tasty texture each time it is used.

    Weight of PORTER:about140g (it varies depending on the attachment)

  3. WASHED HAMPU (Unbleached)
  4. Washed #1.
    Softer than non-washed canvas. It has wrinkles on the surface, and it looks like it has been used.

    Weight of PORTER:about140g (it varies depending on the attachment)

    pic. left, right is #1

  5. LIGHT HAMPU(Unbleached)
  6. Light canvas : Cotton100%

    It has beautiful uniform surface.
    It is about half the thickness of #1, but it has a firm because of high-quality canvas, so it's suitable for chalk bags.
    Lightness is also its advantage.

    Weight of PORTER:about110g (it varies depending on the attachment)

    pic. right, left is #1

    Commonality of #1~#3
    Gentle color : The original color of the material. Cotton residue (black lumps) can be seen on the surface of the fabric, but please enjoy it as a characteristic of the generated canvas.
    Eco-friendly material : It is a material that low-impact on the environment because it is not bleached or dyed.

  8. Raw denim : Cotton100%
    Heavy non washed denim. it has firm.
    As a jeans pants, it becomes color fades and softer.


    Weight of PORTER:about140g (it varies depending on the attachment)

  10. Washed #4
    Softer and brighter than non-washed denim. It has wrinkles on the surface.

    Weight of PORTER:about140g (it varies depending on the attachment)

  12. Heavy canvas : Cotton100%
    Fluorescent paint on the surface. Firm and a little hard.


    Weight of PORTER:about150g (it varies depending on the attachment)

  14. Cotton100%

    Duck is a fabric that has been used for a long time in the United States,this fabric is a reproduction at a Japanese factory.

    In order to reproduce the weaving plan at that time, which can no longer be produced in the US, the same weaving machine as at that time is used, and the production is based on the materials then. In addition, They focused on the dyeing technology of the time (Alizarin dyed) rather than the current dyeing methods, and reproduced the dyeing technology of that time using current technology.

    Looks like vintage fabric, and has dense and firm.


    Weight of PORTER:about140g (it varies depending on the attachment)

    *Before the advent of DENIM, the fabric called DUCK was useful as a material fabric for work clothes and bags and cloths for carrying things in coal mines.
    The texture of the fabric is different from that of canvas, and the fabric that meets the conditions of being a thick and durable fabric with a flat structure rather than a layered structure is called a duck. It is a woven fabric defined by the American federal standards ASTM.
    It is a standard that has existed since the time of World War I (WW1) 1914 (Taisho 3), and is still used as a military material.

    ARMY DUCK belongs to the relatively medium to thin category of DUCK. The feature is that the texture density of the woven fabric is increased by using fine threads. Compared to the same weight duck, it is thinner but denser and stronger.

  15. MA1 NYLON
  16. Nylon100% : Water-repellent

    "MA-1" has its origins as a flight jacket of the United States Air Force.
    Thicker military-style nylon twill woven with high density. A high-performance nylon material that has a sophisticate luster and is water repellent.

    Weight of PORTER:about130g (it varies depending on the attachment)

  18. PE100%

    A material that is resistant to water and dirt used for curing construction sites and agricultural machines.
    It can be placed on dirty or damp ground, and the dirt can be wiped off immediately.

    it is easy to chalk up because of their firm. Even if you get messy, it will return to its original shape. It is also very light.

    Weight of PORTER:about40g (it varies depending on the attachment)

  19. Clear(White plaid )
  20. PE100%

    It is an industrial material used for partition curtains in factories. It is durable and resistant to deterioration such as deformation, discoloration, and deterioration.

    Weight of PORTER:about60g (it varies depending on the attachment)

  22. Nylon100% : Water-repellent, UV-cut

    Ripstop fabric was originally developed in the United States during World War II to strengthen military uniforms and parachutes. The lattice-like structure increases the strength of the fabric, making it resistant to fraying and tearing.
    It is resistant to fraying, tearing, and deterioration, and even if it does break, it has a structure that prevents the tear from spreading. It is also resistant to abrasion and is durable even when rubbed against rocks, which means that the product will last a long time.

    It is so light and thin that it is also used for kites, making it convenient to carry and store. It is also water repellent and prevents some amount of rain and water from penetrating.
    Attractive bright colors. Thin fabrics such as white may be slightly see-through.

    Weight of PORTER:about27g (it varies depending on the attachment)

    Caution: If you rub it or get stuck with a sharp object, it may be cut or punctured. It is also not completely waterproof. If you soak it in water for a long time, it may seep in. Although it has UV protection, but the color may fade if exposed to UV light for a long time.


  2. Cotton100%

    Cotton flannel that is soft and smooth to the touch.

    Recommended for those who prefer simple lining or those who are particular about the texture.

    Compared to nylon, chalk is less likely to fly (depending on how it is used)


  4. Nylon100% Water-repalent, UV-cut

    Thin and lightweight. If you want a lighter or thinner chalk bag, please choose this option.
    Compared to flannel, the chalk moves more easily in the chalk bag.

    Recommended for those who want to keep their lining clean and add bright color in the chalk bag.

  6. To use it as a cooler bag, it is also possible to change the lining to a heat-retaining cold aluminum sheet. It is also useful for carrying around lunch boxes, keeping drinks cold, and when shopping.
    Although the cold retention power is inferior to that of a cooler box, therefore by using ice packs, the cold retention effect will last for about 4 to 6 hours.

    ・Chill things well beforehand
    ・Place ice packs on the top and bottom (it is more effective to put them on top rather than on the bottom) )
    ・Freeze food to use as an ice pack
    ・Avoid direct sunlight
    Caution) When you put an ice pack or icy things, the outside may get wet due to condensation. Aluminum sheets are waterproof, but water may seep through the seams.