Hello
@Rianne
Unsure what sets you use but am sure if you pack them using sterile means into a plastic bag then I can’t see any issue with hygiene as long as the bag is waterproof, only concern is potential damage from them being knocked about in your rucksack so would suggest a Tupperware box for this as you can’t afford to have any damaged sets, also take a third extra what you think you’ll need is my only other advice - also take pens as back up but you may of already thought of this already.