Hello
I don't have a bag, but for your projector to fit comfortably in a bag - with some room for cables/accessories if necessary - the inside or maximum usable inside dimensions of the bag should be about 24-25 cm (width) × 20-21 cm (height) × 20-21 cm (depth).
The device has Bluetooth 5.1 connectivity but does not specify support for connecting two pairs of headphones simultaneously. It features built-in 5W stereo speakers and Bluetooth for audio, but there is no indication that it supports dual Bluetooth headphone connections. Bluetooth version 5.1 is confirmed, but multi-headphone pairing capability is not mentioned in the specifications.
The projector has a built-in stand that can be adjusted in any direction for flexible projections. To mount the projector on a normal tripod, you can use the mounting sockets that are suitable for 1/4-20 UNC Fästskruvar. It is important to choose a tripod that can support the weight load of the projector to avoid accidents.
the thread has the pitch of any photo or video camera. You can mount the projector on any normal tripod. It weighs a little so if possible solid. Excellent device.