Where Can I Find Oven-Proof Ties?

[Mairzydotes]

I use roasting bags to keep my oven clean when cooking roasts etc., but there are never enough plastic ties in the packets.
Is it possible to buy these commercially - I have searched without success.
If not does anyone have any ideas of safe ways to keep the bags closed?

[hc4361]

Trussing string

Amazon.co.uk User Recommendation

[ladybirder]

Oooer. when I read the title I thought you'd caught your tie-in the oven door while you were wearing it!!

[diddlydo]

Can't you just use paper/wire tag-ties that come with rolls of poly bags?

[jomifl]

Stainless steel clothes pegs

[Mairzydotes]

Lovely picture, Ladybirder...
I haven't used trussing string, normally use skewers, but that's a thought.
I wasn't sure about the paper/wire tags, but will give them a whirl.
Thanks for your ideas!1