I am wanting to take some energy powder to add to my water while climbing Kilimanjaro, but I have heard that puches etc can burst at altitude. Does anyone know what container would be suitable to get to the top of Kilimanjaro without bursting?!
Many thanks

Could you put it in a ziplock freezer bag and let the air out at intervals as you ascend?

If you are talking about the tin-foil sachets that the likes of High-5 come in, then it would be a good idea to decant the content into a nalgene bottle and poor the powder out as required. This is a tougher way of transporting it anyway, avoiding the possibility of a ripped sachet spilling inside your pack. I just by the big plastic containers (5kg at a time) of “energy powders” and just take what I need for the day.