The same is true in Nepal. However, most recommend that you resist the temptation to carry large packs, since you can live indefinitely out of a single carry-on. They save you a lot of hassles at airports, and you always have all your possessions with you. There are times when you may have to check them due to airline regulations. Also, if you are carrying a tent or sleeping bag, you may not be able to fit it all into a small pack.
Many travellers are using small, internal frame backpacks, that distribute the weight to their hips.
These have wide, well-padded waistbelts and shoulder straps. The straps tuck away to convert to a conventional suitcase. Dana's Arcflex series, and particularly the Terraplane and Bombpack come highly recommended, but may be expensive. They are superior for off-trail because of an aluminum stay which you can manipulate to fit your back perfectly and spread the load of the pack. Carry a supply of monofilament fishing line, and a needle with an eye big enough to take the line, to repair a pack while on the road.