Bedbugs & Backpacks??

I’m backpacking Vietnam and the last hostel I stayed in had bedbugs (was a highly rated one, I think I’ve just been extremely unlucky)

I’ve sent all my clothes off to the laundry in my new hotel for high heat washing and drying but how the hell do I clean my backpacks? I’ve borrowed my friends Osprey Farpoint 70L - but just the 55L pack, I didn’t bring the daypack - I brought my 20L Kanken instead

I know you’re not meant to use high heat on these but how else can I be sure I’ve killed any bedbugs?? Really freaking out here so any help is appreciated