Hi, the one I have settled on, after years of experimentation, is the De Vilbiss Traveler with a rechargeable battery. I owned it before my InnospireGo, and have been using it again since that died (after less than 2 years.)
I am actually on my 3rd Traveler as my kids love this machine too - they "borrow" it when they travel, and never seem to remember where it belongs. My daughter had to replace the original one this past winter after about 6 years of fairly regular use by her and her 2 little boys.
When I travel, I use disposable neb cups, wash them every day and throw them away after about a week so I don't have to bother about sterilizing. I get over a dozen nebs on a charge, and it can be charged in the wall or in a car. Suitable for use with foreign current adapters too.
With battery, supplies & charger it packs in a case about 5x7x4 inches (?) and weighs less than 2 pounds
Sue