I'd recommend this if you don't mind a little bit of heft. Note that any lock will never 100% stop your bike from getting stolen. It only serves as an extra 'barrier to entry' for a potential thief, with the hope that they'll move onto a bike with a lock that's easier to cut through.

I use two locks and a cable on mine. Adds to the overall weight of the bike but worth it in my opinion. I use 2 of these: https://www.amazon.com/Club-UTL810-Utility-Lock-Yellow/dp/B00CCIM1YQ/ref=pd_lpo_vtph_468_tr_t_2?_encoding=UTF8&psc=1&refRID=BAHGJNG952PVSNXSERGF