Ok let me see...

Merry poppins bag - 
Her name is Mary poppins for starters... unless that was on purpose :p
And I will allow this, only one per group though so you are the only one. The inside is the 1metre by 1metre (3 feet by 3 feet for you American folk) 

Mana storing trinket.
I will allow, it may store up to 2 mana 

Magical clothing - 
As strong as leather.
Allowed

Mana/health potions
A single one of each, that fills 5 mana or health (The candies only replenish one mana or health)

Magical sword:
The enchantment is allowed.

Magical camp
I will allow with this one downfall.
As the Magical campfire must be kept magical, you can not use mana/magic whilst it is in effect (As you are using your own magic/mana to keep it 'real' )
it will not actually deplete mana, but as your magical ability is occupied keeping the magical tent and fire going you can not do other magic. 

Your call if you want it or not. 
You can always possibly buy one in the future. 

@Icicle - The staff can have the same effect as mana storing trinket above.