The Huygens and Ramsden eyepieces are barely usable. They are sitting at the line between junk and “legitimate” accessories.
The 3x Barlow is just a marketing-scam. It won’t provide any kind of decent image for astronomy or daytime observations.
Even the 45-degree diagonal is not a good accessory. Although it is useful for daytime viewing, a 45-degree diagonal is not ergonomic. It should have been a 90-degree diagonal.
The finderscope is not useful. It is simply too small.
The backpack is probably the best accessory that comes with the scope, and it is not necessarily a good backpack.
Overall there is not a single accessory that comes with Travel Scope 50 that is of “average-quality” even. It is sad to see Celestron sending these stuff.