well a messenger bag is quite often used as a school bag but if you don't want to use it for that then you could put anything in it even books purses anything that you would put in a normal handbag or a school bag.
You can find the messenger bag from Lost by checking through online stores. You can as well pay a visit to local stores as some may stock the bag.
ebay
There are many places where one could find a messenger bag designed for use by a man. The best places where one could purchase messenger bags would be Amazon.
A brown messenger bag is typically used for carrying daily essentials such as a laptop, work documents, notebooks, and personal items. It is a versatile and functional bag suitable for work, school, or casual outings.
The average cost of a Burberry messenger bag varies depending on the exact size of bag and type of fabric. For example the average price for a check messenger bag is ´£692.96, whereas a Turin messenger bag costs around ´£452.69.
At online stores; but you may just about find about everything also at; Amazon.co.uk and Ebay.com cheap.
You can find them at Target. Also try ebay.com or amazon.com.
SHOULDER or MESSENGER BAG
The consenus for the best fabric for maiking a messenger bag is Ballistic Nylon. Online at mommybydaycrafterbynight, you can get a step by step tutorial on making a really cute messenger bag.
They have similar bags at Anthropologie.
One can possibly find a funky laptop case at an online retailer such as Amazon, or an auction site such as eBay. Another option is to take a plain laptop bag and add one's own design elements to make it match their style.