A duffle bag is usually smaller than a suitcase. The biggest difference between a duffle bag and a suitcase is that a suitcase usually has hard sides while a duffle bag has soft sides.
Suitcase or bag
A suitcase
With a rope
Trolley or travel bag or suitcase
Overnight bag, it's just a small suitcase, usually
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Why not? Ok, what next? (:
Usually, in most cases, yes, this will not be a problem.
The first trolley bag, or suitcase on wheels, was invented in 1908 by James Cole. It was called the "Dawn-Mobile".
As many as you can put in your suitcase, and in you bag and in your hands.
The opposite of a suitcase is difficult to investigate, but what people have agreed with is that it pairs off with the handy 'rucksack' while the clutch bag and handbag pair off as they are the more 'handy' types of bag. Originally the handbag, rucksack and suitcase were all in a trio, but ir was decided that the clutch bag should join as it's handy along with the handbag.