General Synonyms:
* Bag - A very general term, but often suitable
* Knapsack - A backpack, usually with straps
* Pouch - A small bag, often with a drawstring closure
* Kitbag - A bag for carrying equipment or tools
* Briefcase - A flat, rectangular bag, usually for carrying documents
* Schoolbag - A bag designed for carrying school supplies
More Specific Synonyms:
* Haversack - A type of satchel often used for carrying supplies on hikes or camping trips
* Gym bag - A bag specifically designed for carrying gym clothes and equipment
* Messenger bag - A satchel with a long strap that can be worn across the body
* Laptop bag - A bag specifically designed for carrying a laptop
The best synonym for "satchel" will depend on the specific context in which it is being used.