Make sure the bag is 1 quart, the TSA-approved size for your toiletry bag. Technically you can have a smaller bag if you don’t have many liquids, but 1 quart is already pretty small.
In terms of more basic toiletry bags, you can find some for fairly cheap that are only a step above the Ziploc bag, yet more sustainable. They should cost you no more than $15 USD and often come with the bottles.
While the price is a bit high for a toiletry bag, Tom Bihn makes high quality products for travel.
It has one clear panel so you can see what you’re carrying, is made of water resistant ultrasil material and features tough YKK zippers.
It has three compartments: one that is clear and approved for airports, one that is mesh and zippered for non-liquids and one in the back for your comb and other essentials.
Separate your liquids and non-liquids with this two-part bag that has a hook to hang up for ease when getting ready. The patented two-section feature keeps the rest of your items from getting wet in case a bottle leaks.