Homemade heat packs without a microwave

Homemade heat packs without a microwave

An earlier post reminded me of a question I've had for awhile. I have some material perfect for making some heat packs, the kind with the rice, flaxseed etc in them. But we don't own a microwave, and don't plan to buy one either. Is it okay to heat these in the oven? To me it screams fire hazard, but maybe I'm wrong. Is there any other way I could heat it safely?
Our living room!

Our living room!

Orchid questions

Orchid questions

My terrace again

My terrace again

love this community!

love this community!

Another plant identification

Another plant identification

What are these 2 evil weeds? How do I make them dead?

What are these 2 evil weeds? How do I make them dead?