difference between Standard & economy hotels.

If you intend to book a tour online, the first part you need to check is the "About Us" section, where you can see the basic information about the company as well as corresponding licenses and other related documents issued by the authority.
Then you need to check whether the company is accepted by the authoritative tourism organizations.
The last thing you need to check whether the company has experience of providing long and professional as well as quality and considerate service or not.
After you check these information, I think you can have a general ideas about the company and may make your decision on your own.

For the check-in baggage, one piece of luggage cannot be over 40*60*100cm (15.7*23.6*39 inch). For the handbag, it cannot be over 20*40*55cm (7.8*15.7*21.6 inch).