I generally carry 25% of my bankroll with me. This represents 33 of my maximum bets. I keep another 25% in my BR only bank account, which is located in a national type bank that have offices in most locations that I play. This way I have access to the money relatively quickly. I may have to wait 24 hours for the branch to open, but if I have already lost 25% that quickly (which has never happened), I am ok with taking a 24 hour breather to regroup.
If at anytime during a trip my initial 25% dips delow 25 max bets, I will visit the bank and reload back to 33 max bets. When traveling between domestic locations, I place my inital 25% into the bank account and withdrawl it upon arriving at the destination, rather than carry on "planes, trains or automobiles". I have yet to play outside the US, so I haven't had to figure that strategy out yet.