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If i understand it correctly, then you will like Sony eriscsson MW600 or Nokia BH-221

Well I use a trust Headset,you could like it.Name:

Trust FreeWave Wireless Headset

The background noise may a bit loud if you don't listen to music,but otherwise it is fine

In that case I don't know really , i thought you needed it for PC use, you should just search the webs.

i did some googling
http://www.amazon.co.uk/Rapoo-Wireless-Headphones-Tablet-Koolertron/dp/B0050G83RQ
is this what you are looking for ?

Would a pair of Bluetooth headphones work?

Like these?

You could always buy something like this and then pair it with your Bluetooth headphone of choice.

i got Logitech G35, are too good, 7.1 amazing sound quality and wireless, got a battery that u can charge via usb.
image i buyed 2 years ago or something and still work perfectly, the main problem its the price, arround 100€ or more.

so you want 5kg headphones, that sound terrible, cost much, got an 3,5mm jack with a small box for wireless, even if 3,5mm jacks cant deliver enough energy. should be no problem to find

I use this: http://www.amazon.com/IOGEAR-Bluetooth-Micro-Adapter-GBU521/dp/B007GFX0PY/ref=sr_1_9?ie=UTF8&qid=1358347234&sr=8-9&keywords=Bluetooth+adapter

Paired with this: http://www.amazon.com/Sony-DRBT101-BLK-Bluetooth-Headset/dp/B001QXDSMW/ref=pd_sim_e_10
but any normal bluetooth headphone would work with that adapter.

Wireless, but includes a port for a regular jack? I know of and own a few USB wireless headsets, but I haven't seen many that include a 3.5 jack.

http://www.newegg.com/Product/Product.aspx?Item=N82E16826462001
This item is wireless Bluetooth. It can accept 3.5mm jack instead of wireless, and can be recharged with USB.

I'm using these atm.. The transmitter isn't too big.. Maybe a lil too big for a pocket tho.. d-:

http://en-de.sennheiser.com/wireless-headphones-digital-stereo-rs-160

Probably the best part is the sound quality.. Its as good as a wired one.. (-: