My 9 month old is the opposite - slow to wean but LOVES finger food so we feed her by snacks. LOL YY we are all about banana too!
I take ... organix banana biscuits (bought but pretty ok ingredients), rice cakes, home made pastry cheese straws, washed raspberries, little egg "patties" made by baking beaten egg in a cake tin, brioche and croissant (mumsnet stereotype lol), bread sticks, cornflakes (she loves to eat them like crisps lol), bread with peanut butter or cheese spread.
I bought a mini cool bag off eBay which I store under the buggy. They have similar ones in poundland at the moment - just means cheese etc stays cool and fresh.