We strongly recommend that you study the weather conditions before the Race. In case of the slightest fear, take a thermal cap with you. To 'optimize' the extra weight of just 60 g (including plastic packaging) does not worth the additional risk you take on.
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Before we start making your backpack, we will send you a layout for approval. Be sure that all your design wishes will be taken into account and you will get exactly what you want - your unique personal backpack!