Weapon, where fixed blade knives are illegal to conceal?

I like the SA bantam cause of the multi tool bit.

On those locking biners- they usually get frozen closed because someone locks them when they are under tension. Just girth hitch a sling around them and add a bit of body weight and they should unscrew. I have collected several this way at anchor stations where people did a hanging belay before they screwed the gate closed.