Seeing that today was the last day available for certain purchases in the RT store, I decided to buy a pack

But I would also like to add more to this current pack further down the line.

Will I be able to add RTP to my account later and add more items from the Founder Store [like Viper Jetbike etc]?

Thanks

Yes, yes you will.

Thanks! Had to get it today then =) Although it isn't showing that on my avatar why is that :<

Have you went into the options and actually applied the pack?

Yeah, I also made characters and bought items for em [can't do that without activating one.] Do I need a pre-existing character in order to be able to buy the current RT items at a later date? Or is my account tagged as being able to buy them anyway?

The current RT items arent getting removed from the store till the games release, well outside the 4 gifts of melee weapon/sidearm combo.

On the not showing end, you might wanna use the "Contact Us" option at the bottom of the page.
But before doing so try reloggin and clearing the browser cache.

sorry, could you guys be kind enough to tell me what is this last day of purchase about? I have no clue what you guys talking about right now

The Founders packs sale wont last till eternity, probably till launch or maybe even till open beta. Afterwards all the items that are going to be labeled "Founders only" (coming soon) are going to be removed from the same.