Re:Traveling around the world...
Dude, i got back from 14 months around the world at xmas. I will say this too you...
Firstly, enjoy your travels man, the gym will be here when you get back. Don't worry about losing weight etc. You will find that naturally you will lose body fat as the food is totally different outside Europe and the US. Genetic farm doesn't exist there so the foods are healthier. Strength and mass may appear to reduce but i can guarantee you that once you get back and start training again it all comes back very quickly. 3 months almost since i got back and i have all my strength back and i am much leaner than before so i am very pleased.
Secondly, if gyms are not available then utilise your bodyweight. Chins, press ups, hand stand press ups, body squats, 1 leg squats. Use your bag as a weight for rows and shoulder presses and triceps or bis for example. You'll be amazed how inventive you can be when you want to.
Thirdly, take a pair of running trainers. Never a bad thing to have with you. Improving your cardiovascular fitness is so beneficial for weight training IMO and when you have so much time on your hands it's the perfect way to kill some time and get really healthy. The benefits are brilliant. I ran in some of the most bizarre places you can imagine, including the Sahara Desert, and although you will get some rather odd looks you will love the effects when you are back.
Enjoy yourself bro. The gym will always be here, travelling is often a once in a life time opportunity...good luck