Thank you for this question!
Just the Goods' packaging is selected to minimize the risk of product spoilage because formulas are made without artificial preservatives. Larger formats may increase air exchange/exposure, or simply contribute to product going rancid or mouldy before there's a chance for it to be finished under conventional use conditions.
With respect to facial care products and hand/body lotion: Many products sit well for a long time when unopened (i.e. extra bottles purchased to combine shipping and reduce the carbon involved with transportation), but unless the bottles are keep in suitable storage conditions (i.e. in a cool, dark place away from high temperatures and humidity), there is a chance they can go bad. Even though some products can last up to 2 years after opening (i.e. deodorant) I always prefer to suggest 6 months, just to be on the safe side. More specifically, a 4 oz bottle of facial moisturizer can take 2 - 3 months, or even 4 months, to finish but an 8 oz bottle would surely go bad before someone could use all of it. And so, ultimately, maintaining 4 oz bottles for facial care products helps to protect the product and reduce the chance of disappointment in something going bad before it's finished.
Having said all that, unlike conventionally sold retail products, Just the Goods products are handmade to order and are offered at public wholesale pricing, which means they are always offered at the best value possible, regardless of size. For more information about how Just the Goods products are priced, please visit: https://justthegoods.net/pages/how-are-just-the-goods-products-priced.
More specific to the question about travel sized products: another consideration for why Just the Goods doesn't offer a larger range of product sizes is due to the amount of time it takes to produce and distribute multiple formats. All Just the Goods products are handmade so having too many varieties of packaging increases the time, energy, and other resources it takes to make and package products, and to prepare orders for shipping. Having more bottle sizes than we already carry also means spending more per unit of packaging because we would be buying smaller quantities of more sizes than larger quantities of fewer sizes. It also creates inventory and storage issues, which is already quite difficult to navigate as a result of current global supply chain disruption. And, having said that, truthfully our current offering of both aluminum and plastic while working to phase out plastic is quite cumbersome making the prospect of adding more sizes not feasible at this time.
I hope this is helpful information! Thanks again for asking!