Frequently asked questions

The products, the choice of the backpack, the maintenance or the guarantee of your bag. Find our FAQ below.


What sizes are available for the backrest?

The backbone with its removable EN-1621-2 protection is available in two sizes: S/M and L/XL. The format of the backpack is identical in both sizes (the different zip-ons are adaptable to both models). What changes is the length of the shoulder straps, the length and the positioning of the waist belt. The waist belt will be lower on the L/XL base, so the gap between the waist belt and the shoulder straps will be greater on the L/XL base.

The choice of the size of the back pad depends on the height of the chest (the height is measured from the iliac crest to the shoulder). It is therefore an important measure that ensures optimal protection.

The model S/M suitable for :
- a bust height of 34 cm to 43 cm
- a maximum hip circumference of 108 cm (allowing Velcros to be hooked), and an additional 5 cm using the elasticity of the right side, i.e. a total of 113 cm.

The model L/XL suitable for :
- a bust height of 44 cm to 56 cm
- a maximum hip circumference of 114 cm (allowing Velcros to be hooked), and an additional 5 cm using the elasticity of the right side, i.e. a total of 119 cm.
  FAQ - Size of backbones

Do the two sizes of backbones imply two sizes of protection?

No. The back protection is the same in both back bases, i.e. a length of 45 cm.

Is it possible to buy only the back protection?

For the time being, no. This back protector is only available with the back base.

What is the technical information on my back protector?

The ASB (Anti Spine-Blaster) back protector in each PRISM backrest base is made of foam memory polyurethane. It absorbs the shock on impact and distributes it over its entire surface.
back protection with memory foam

This material offers optimal shock absorption compared to traditional foams. This viscoelastic polyurethane also offers incomparable shock absorption due to its high stability.

This, together with the slow recovery foam, makes it ideal for action sports where extreme shock absorption is required.
This premium protection also ensures a perfect fit and maximum wearing comfort.

Its polyurethane foam composition offers a level of strength (chemical resistance, water resistance, tensile strength, tear strength) that many EVA foams do not.

This protection is approved to exceed the most stringent requirements of the motorbike standard EN-1621-2:2014.

Does the HYD 10 have back protection?

No, the HYD 10 does not have back protection. It has a slot for a water bag up to 3L, but it is not included.


What protection is there for a certified backrest?

There are two possible levels in this standard: EN-1621-2 Level 1 and EN-1621-2 Level 2. The test that differentiates between these two levels consists of dropping a 5kg load from a height of 1 metre (i.e. 50J) onto the protection, and 5 times. The amount of residual force is then measured in kN.
back protector

At Level 1The average residual force should be less than 18 kNwith no value exceeding 24 kN.

At Level 2The average residual force should be less than 9 kNwith no value exceeding 12 kN.

The average residual strength of our back protection is 10.6 kN with no value greater than 12 kN, the level chosen is 1, but very close to 2.

The international organisation SGS has tested the chemical composition of this back protector and guaranteed the absence of heavy metals (cadmium, mercury, lead, etc.), phthalates and chlorinated paraffin.

SATRA Technology, an independent testing and research organisation based in the UK, has conducted the certification tests for our back protector.

What kind of protection for an approved back protector?

back protection protection standard for motorcyclists
The term "EN 1621-2" must appear on the equipment, together with a motorcyclist pictogram to which is added the number 1 or 2 according to the level of protection, and the letter B, or BL, which specifies which area is covered by the motorbike back protector (B for the upper back, BL for the whole back).


What materials are used in PRISM backpacks?

The inner and outer fabrics of the back and zip-on bases are made of recycled nylon and polyester.

The fabrics used for the helmet holders are, in fact, fabric recycling! With the agreement of our manufacturers we reuse their fabric scraps and the small quantities that are sitting in their warehouses and would have been lost. We then match the colour of the marking on the zip-on to the colour of the matching helmet holder!
Co18 pink

Have any tests been carried out on my PRISM backpack?

All the elements of the Switch Element System concept (back base, various zips, helmet carrier) were tested before being put on the market by a specialised organisation, a world leader in its field: SGS. A battery of very demanding mechanical and chemical tests were carried out with two objectives in mind:
the mechanical tests measured the strength (tear strength, tensile strength, Musi zip, seams, handle), wear resistance of the fabrics, compression and strength of the back and lumbar pads.
then the chemical tests validated the absence of prohibited organic substances in order to comply with the European REACH regulation.
These tests guarantee that the materials used as well as the manufacturing are up to the task of intense use in the worst conditions. You can go ahead, your PRISM backpack will follow you everywhere!

Can I buy my backpack components separately?

Yes, the Switch Element System concept allows you to compose your backpack as you wish and therefore to buy all the elements separately. You don't have to buy a complete backpack to change the volume.
Is there a rain cover available?
A rain cover is present in the 18L (Cobalt 18) and 25L (Krypton 25) zip-ons. It is located in the pocket under the volume, which also has two 40cm straps with aluminium buckles for additional equipment transport. It is removable for easy maintenance and use on the 10L and 11L zip-ons (Helium 10 and Helium 11).
The rain cover is made of waterproof polyester. A PRISM logo in reflective print ensures visibility at night.

Why are there different strap ring positions?

The strap rings are the attachments for hanging the helmet carrier.

strap rings
There are two proposed positions:

- the strap rings positioned on the back base: they are located at the back of the Musi zip and therefore protect it from excessive forces. This position is recommended:
- for transporting heavy or bulky equipment requiring a strong pull on the straps to secure the helmet carrier and secure the load.
- for the compression strap function when the zip-on is not completely filled. In this case, the helmet holder is used to press the contents of the bag against the back base to ensure the best possible support and carrying comfort.
- strap rings positioned on the zip-on: they are located at the front of the Musi zip. They are to be preferred when there is no pulling force on the straps of the helmet carrier. This is particularly the case when the helmet carrier fulfils its aesthetic role of personalisation.

There is also a series of strap rings on the front of the Cobalt 18 and Krypton 25 zip-ons, anticipating future accessory developments.

Is it possible to wear skis with the current volumes?

Yes, with the Titanium 22 and Tantalum 33 zip-ons. These zip-ons have been specifically developed to allow the transport of skis, snowboards and all the equipment necessary for comfort and safety in the mountains.


Do the modular headset holders fit on the HYD 10?

They are a bit larger, but the assembly is possible.

Will my helmet touch the top of the bag when I am in the down position?

No. The PRISM backpacks have been developed over many months with an ergonomics engineer and tested in real-life conditions. We have paid particular attention to how the bag fits on the back in all circumstances. It must be forgotten. The top of the bag has been designed so that there is no discomfort or contact with the helmet, including a full-face helmet, even when the head is in the rear position, when riding downhill. It is even possible to wear a neck brace.


Does the water bag come with my PRISM backpack?

No, the water pouch is not included in the scope of supply but is available in our accessories shop. The back base has a "Watertray" slot to accommodate a water bag up to 3 litres. Three Velcro attachment tabs are provided to accommodate any model available on the market (central or side attachment).

How do I access the water bag when the bag is assembled?

The Helium zip-ons (10L and 11L) do not have an integrated compartment and their assembly on the back base allows direct access to the water bag.
The Cobalt 18, Krypton 25, Titanium 22 and Tantalum 33 zip-ons have a separate main compartment and are equipped with an inner zip, which is located at the top and opens at the back.

water bag access
The opening of this zip gives access to the water pocket and the back protector. This access can also be used as a "security pocket" for identity papers when using public transport or when travelling.

Is there a pocket for carrying a bottle on the side of the bag?

For the time being, no. The PRISM backpacks have been designed to avoid any risk of snagging during use. To this end, no elements have been integrated on the sides. The safety of the users was the main consideration in the design.


Could I still assemble my zip-on and backbone with future PRISM developments?

It is the will of the PRISM brand to allow users to upgrade their equipment. The interest of the modularity of the Switch Element System concept is to be able to transform one's bag from 11 to 18L, or from 18 to 25L, or from 11 to 25L, by simply changing the zip-on assembled on the back base. And the same will be true for future developments.
The YKK MUSI zipper, which is ½ on the back and ½ on the zippers (existing and future), is calculated on a fixed number of teeth, thus hiding the risks linked to seam variations. It ensures a perfect fit, even between an item purchased today and an item acquired several months or years later.


Can I wash my PRISM backpack in the washing machine?

First of all, for the back bases, we recommend hand washing in 40°C water.
Then, for the zip ons, it is possible to wash them in the washing machine, at 30°C / synthetic programme / delicate colours.
For more details, see our section "How to care for your PRISM backpack".

How do I maintain my rain cover?

The rain cover is removable, which makes it possible to clean the bag independently. Machine washing is possible at 30°C / synthetic programme / delicate colours.


How does the guarantee work?

PRISM backpacks come with a 10 year warranty covering zips and seams under normal use.
HYD 10 helmet carriers and compact bags come with a 2 year legal warranty.