I know some people keep them wet but I just wet mine straight from the tap as I need them. I usually wet two of them on my way to changing the nappy, if I need more I just use the foamy wipe solution I keep with them for just in case. When I go out I take dry wipes in a zip lock bag and a 50ml bottle of foamy wipe, that way I don't need to worry about taking wet wipes around (or forgetting them and ending up with stinky, mouldy wipes in my nappy bag), and of course the used ones just get rolled up with the nappy and put in the wet bag.