We do not recommend applying iron-on patches to our packs with heat as it does have a low melting temperature and can become damaged. The most effective way to apply a patch would be to sew it to the pack, and seal the holes on the inside of our pack with something like our Dyneema Repair Kit.
Note, applying patches or altering your pack does void its warranty, and depending on the location, may hinder future repairs. For more info on our Warranty + Repairs, click here.