The Thali Cafe has a brilliant take-away system, which we enjoyed when we visited my sister-and-brother-in-law last year: when you buy your curry, you buy a 'Tiffin' Take-Away tin, which holds three curries and a portion of rice.
What a great, eco-friendly idea! No waste, no sticky leakage, and the food stays hot. Plus, the menu and the food are delicious. If you're in the Bristol area and fancy a curry, please go there!