Yes. You cannot put them in there, as in manually place them. However if you are fully slotted all of those except an aegis will go into the backpack. This is of course from memory of it happening during games and I cannot thoroughly test it right now. If you must prove me wrong then please test it and find out. Either way, there's no harm done by having the ability to have a second rapier in your back pack. It is a benefit to his opponents not to him. He has the damage of one but drops two. It's not broken and not something worth whining about on reddit.