Have you looked on the website of the Civil War museum in Richmond, Virginia? They have a TON of photos online of exactly what you're talking about, personal items carried by the soldiers. Just use their search feature and you can find all sorts of stuff from canteens to handkerchiefs to cartridge boxes to folding field desks to gloves and long underwear. Here's the link:
https://acwm.org/collection
https://acwm.org/collection/archives/military-objects
Hope you like it as much as I do. It doesn't have
every single type of thing carried by the soldiers but everything on there is a genuine period item, not a reproduction or modern fake, so it's at least good as sort of a reference guide to what something is supposed to look like.
Also, and forgive me if someone else already mentioned it, but there are several books in print that are designed as guides, some as price guides even, to collecting Civil War artifacts. I have a few of them. Some of the more well-known ones it seems are Francis Lord's
Civil War Collector's Encyclopedia (Vol. 1 and 2 are sold together, and Vols. 3, 4 and 5 are sold together), Chuck Lawliss's
The Illustrated Encyclopedia of Civil War Collectibles, Richard Friz's
Civil War Collectibles Price Guide, the several editions of
Warman's Civil War Collectibles and Robert Jones's
The Civil War Soldier - His Personal Items. On Amazon you can buy some of them used for a nice cheap price and they might be a good place to get started. I personally can't afford to collect but I just like to know what the gear looked like and have photos of it.