Packable rucksack/backpack

Anyone know where i can get a properly packable (i.e. will fit in jersey pocket) rucksack?
Off to France in a couple of weeks, plan is to get in a few early morning rides but would be handy to have rucksack so i can stop at the bakers (a couple of miles from where we are staying) and pick up some baguettes/croissants etc on the way home. Doesn't need to be super comfortable as only for short periods, I imagine to be packable will have strings rather than straps over shoulders.
Cheers
Off to France in a couple of weeks, plan is to get in a few early morning rides but would be handy to have rucksack so i can stop at the bakers (a couple of miles from where we are staying) and pick up some baguettes/croissants etc on the way home. Doesn't need to be super comfortable as only for short periods, I imagine to be packable will have strings rather than straps over shoulders.
Cheers
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Both the drawstring and strap type work well for sticking in your jersey pocket and carrying baguettes back. The webbing strap type are better if you want to add a bottle of wine.
Breakfast wine obvs
https://www.decathlon.co.uk/pocket-bag- ... 05180.html
Robust enough to carry a fair amount of weight - I've used it to take home shopping including 2 litre bottles but packs tiny. Only £3 do not the end of the world if you damage or lose it.
or improvise, hiper dino plastic carrier bags can be 'stretched' to get arms through the hand holes and make an ultra light back pack for crusty bread and a couple of cans of beer, i'm sure it'll work with many others
for heavier/bulkier, i've got one of these, it'll pack small enough to fit some jersey pockets...
https://www.amazon.co.uk/Life-Venture-L ... B00EKW74Z8
...had mine 6-7 years