I thought it would be great to take some rather unique Newfoundland beer back to Vancouver after a Lonely Planet research trip. I packed the six bottles of beer carefully in a rubber dry-bag (from my kayak) and bundled my clothing around each of them to ensure that the odd knock wouldn't shatter them. But when the bag eventually arrived in British Columbia a week later (another story!), the bottles had all survived – caps still sealed – but the beer had not. The changes in pressure during the flight had lifted the caps off enough for the beer to escape, and when the plane descended the caps resealed themselves.