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

As that name implies,it was originally used to make sails.

This fabric has good breathability and toughness that means it’s well-suited to harsh environments and has long been used for outdoor activities.

We use only high-quality, high-density canvas which is durable and has a beautiful texture. It’s strong enough to withstand hard use, and improves with age and use.

As this fabric ages it reflects the personality of the user, and bags become personal to the user.
This is why we use this fabric 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 to create a strong material with a sophisticated waffle texture.. It also has a solid thickness and firmness.
    The feel of the fabric improves with use.

    Weight of PORTER:about 140g (varies depending on bag attachments)

  3. WASHED HAMPU (Unbleached)
  4. Washed #1.
    Softer than non-washed canvas. It is a wrinkled fabric and has a used look.

    Weight of PORTER:about 140g (varies depending on bag attachments)

    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 is also firm due to the quality of the canvas, so it perfect for chalk bags.
    It’s lightness is also an advantage.

    Weight of PORTER:about 110g (varies depending on bag attachments)

    pic. right, left is #1

    Commonality of #1~#3
    Gentle color : All materials are unbleached and therefore show the original colour of the fabric. Cotton residue (black lumps) can be seen throughout the fabric, and add character to the canvas. Eco-friendly material : The material has a low-impact on the environment because it is not bleached or dyed.

  8. Raw denim : Cotton100%
    Heavy, firm, non-washed denim.
    As with jeans, this fabric’s color fades and becomes softer over time.


    Weight of PORTER:about 140g (varies depending on bag attachments)

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

    Weight of PORTER:about 140g (varies depending on bag attachments)

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


    Weight of PORTER:about 150g (varies depending on bag attachments)

  14. Cotton100%

    Duck is a fabric that has been used for a long time in the United States, and this fabric is a reproduction made at a Japanese factory.
    In order to reproduce the original weaving technique which can no longer be produced in the US, we employ the weaving machines that were used to make the original fabric and the production is based on the materials that were made then. In addition, the dyeing technology of the time (Alizarin dyed) is used, rather than current dyeing methods. This fabric looks like a vintage fabric, and is dense and firm.


    Weight of PORTER:about 140g (varies depending on bag attachments)

    *Before the advent of denim, duck was used for work clothes and bags and including to make bags for carrying coal out of coal mines.
    The texture of the fabric is different from that of canvas. Duck is a thick, durable, flat fabric rather than a layered fabric. It is woven in a manner as defined by the American federal standards ASTM.
    This standard has existed since the time of World War I (1914) (Taisho 3), and is still used as a military material to this day.

    Army duck sits in a category of duck which is considered medium to thin when compared to other types of duck. A unique feature of army duck is that the texture density of the woven fabric is increased by using fine threads. Compared to other duck fabrics of the same weight, 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.
    It is a thicker, high-density, military-style nylon twill, and is a high-performance nylon material that has a sophisticated luster and is water repellent.

    Weight of PORTER:about 130g (varies depending on bag attachments)

  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 dirt can be wiped off easily.
    The firmness of this material makes it easy for climbers to chalk up. Even if the bag gets messy, it will return to its original shape. It is also very light.

    Weight of PORTER:about 40g (varies depending on bag attachments)

  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 and discoloration.

    Weight of PORTER:about 60g (varies depending on bag attachments)

  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, tearing and deterioration. Even if it is damaged, it has a structure that prevents tears from spreading.
    It is also resistant to abrasion and is durable even when rubbed against rocks, meaning products made from this fabric are long-lasting.

    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, preventing some amount of rain and water from penetrating.
Attractive bright colors. Thin fabrics such as white may be slightly see-through.

    Weight of PORTER:about 27g (varies depending on bag attachments)

    Caution: May cut or puncture due to prolonged or severe abrasion, or in the case of puncturing. Not 100% waterproof. If soaked for an extended period water may seep in. Although it cuts UV, color may fade if exposed to UV light for extended periods.


  2. Cotton100%

    Cotton flannel that is soft and smooth to the touch.
    Recommended for those who prefer a simple lining or those who are particular about the texture.

    Compared to nylon, chalk is less likely to disperse (depending on use)


  4. Nylon100% Water-repalent, UV-cut

    Thin and lightweight. If you want a lighter or thinner chalk bag, we recommend this option.

    Compared to flannel-lined bags, chalk moves more freely in bags with a nylon lining.

    Recommended for those who want to keep their lining clean and have a bright interior in their chalk bag.

  6. It is useful for carrying around lunch boxes, keeping drinks cold, and when out shopping.

    Although the temperature retention power is inferior to that of a cooler box, using ice packs will allow for cold to be retained for around 4 to 6 hours.

    - To increase the cold retention ability -
    ・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 frozen item inside the bag, the outside may get wet due to condensation. Aluminum sheets are waterproof, but water may seep through the seams.