When my smaller batteries arrive I will just give the eGo hard case in the rucksack a go, but it will mean stopping to have a vape. Next time I place an order I will add a lanyard to my cart as well and give it a go with a mini battery I think. I did used to smoke a bit when riding but can do without until I make a stop.
Thanks for all the great advise guys/gals, really liking this forum