Flavorbooks would be available in different sizes, depending on the how much they need to carry and where they need to go, and were inspired by my trusty Moleskine type drawing pad.
Small would be suitable for cream and coffee, and even taking juice on the road or lunchbox.
Pages are made from roll to roll plastic, with clever inline checkvalves molded into the plastic to help keep air and bacteria out.
The spout can be heat sealled at bottling plant, split open to use by consumer, used as a straw, then to close, folded over with a rubber band or binder clip to hold it in place.
It needs no separate lid, cap, straws made out of a separate material. It's easy to recycle, or remake. Flat pack is easy to mail back along with spent ecopackets.
Pages can be stacked like in a book for additional volume and made only using inexpensive roll to roll simple film, that costs less to ship around than empty hollow cans and bottles.
It operates a bit like a bellows in that squeezing helps press out the contents almost completely,
This along with the checkvalve doesn't leak if tipped over, but if squeezed will pour out in a controlled fashion, and it doesn't need caps or straws, allowing it to be operated with one hand at all steps.
Below a closer look at the 'pinch' checkvalve (hard to see the valve).
With the checkvalve, there isn't a need to use a twist or flip on cap to maintain freshness reducing steps required for operation.
This Airless approach throughout the operation, greatly extends the sweetness and shelflife of coffee, milk, cream, wine, and juice as in normal bottles it's the constant "breathing" from opening and closing bottles, that lets in airborne bacteria, mold, and yeasts as well as oxygen that cause typical spoiling.
Tips can be coated with teflon or other hydrophobic material to be drip free, and antibiotics for sterility (e.g. silver)
could be made with any material (hardboard, cardboard, plastic, wood, metal, bamboo) to match the kitchen style and be easily washable. It helps it like a book stand on it's own.
Shown below in autoclavable sterilizable plastic, in liter sizes perfect for milk and yet still one hand use.
ONE HAND USE
One hand use is important many segments of the population have limited hand use, like in RSI, Arthritis, Elderly. It's only after you lose one hand you realize how hard normal life becomes, opening jars, making coffee, even pop top milk bottle tops can be annoying.
The hard cover like a book on it's end can stand on it's own everywhere, easily grabbed and put back.
In our model one hand use is simple as open the refridgerator door, hold open with body reach in with one hand to get bottle, tilt over cup, then gently press to trigger flow, precise control for even small glasses, tilt back up to stop flow, tap once to shake off the lingering drops if any, optionally rinse, then put back in fridge. No caps, screw tops, no messes. No bulky bottles filling up the recycling bin, less taking out the trash= higher quality of life.
Rigid Hardcover book, helps keep the formless bag upright into the refrigerator door, and many like an encylopedia, can be set compactly side by side (juice, water, tea, coffee) in higher space utilization than random bottles you get from the store (like the maple syrup shown).
For portable keychain pump dispensors could be integrated with a "dock" like function (shown in drawing) for multichannel refills (e.g a page for coffee, one for cream, one for sweetener) dispensed and mixed precisely together when served (e.g. precisely sweetened coffee and cream to go), via microfluidic like flow controls.
Could be used for just about anything you'd typically find in the fridge, almond milk, daily milk, cream, juice, wine, purified water.
Most of which could survive in a mailbox or outside a door for a day with a reuseable chill pack so could be mailed.
This model is already partly done in delivery services like milk and eggs in los angeles.
Also place your spent refill bags/pages into a flat pack mailer with the spent chill pack with your spent ecopackets. Which might be like this other entry
In a future service of full service of commodities "pay as you go" and an intelligent flavor book that knows how empty it is, a delivery driver gets notified of what's out, picks up the spent, replaces with fresh. Spent pages are cleaned and reused or remade as appropriate eliminating landfill waste.