It depends on where and how you’ll use it. Here’s a quick guide:

• Travel and gym: 2–3.4 fl oz (60–100 ml) fits most carry-on rules and keeps bags light.
• Everyday shower use: 10–17 fl oz (300–500 ml) balances capacity with easy handling and fits most caddies or shelves.
• Family or high-traffic bathrooms: 16–32 fl oz (500–1000 ml) reduces refills, especially for shared shampoo and body wash.
• Wall-mounted dispensers: Each chamber is commonly 300–500 ml, which works well for shampoo, conditioner, and wash.

Measure your shelf height and depth first, and consider sets with clear labels so everyone grabs the right product. You can filter by size online and choose pickup or delivery for convenience.

Many refillable shower bottles and pump dispensers can work with thicker products, but a few details help:

• Choose a pump style: Look for pumps with a wider nozzle and sturdy spring; squeeze bottles also handle thicker formulas well.
• Dip tube tip: Trimming the tube at a slight angle can help it reach product at the bottom.
• Refill slowly: A wide-mouth opening makes thicker products easier to pour.
• Consider dilution: A small amount of water may help some formulas flow, but always check the product’s label first.
• Avoid foaming heads: Foaming dispensers are designed for thin, pre-diluted liquids and usually won’t work with heavy conditioner.

If clogs happen, rinsing the pump with warm, soapy water can help.

Regular cleaning helps your refillable shower bottles work smoothly and keeps formulas fresh. A simple routine is:

1. Empty and rinse: Rinse out leftover product with warm (not boiling) water.
2. Wash: Use mild dish soap and warm water; pump the soapy water through the pump a few times.
3. Rinse thoroughly: Rinse until no suds remain; a final pump of clean water helps clear the mechanism.
4. Dry: Air-dry completely with the pump open to reduce moisture inside.
5. Refill: Use a small funnel to reduce spills, then close, prime the pump, and apply a label.

A gentle clean between product changes and periodic deep cleans can help maintain performance, but results can vary with different formulas and usage.

Many wall-mounted shower dispensers include no-drill adhesive mounts. For best results:

1. Prep the surface: Clean a smooth, non-porous area (tile, glass, metal) and let it dry fully. Avoid grout lines and textured walls.
2. Apply adhesive: Align carefully, press firmly for the time recommended in the instructions, and remove any air bubbles.
3. Wait time: Allow the adhesive to cure (often up to 24 hours) before filling or hanging bottles.
4. Load within limits: Stay within the dispenser’s stated weight/capacity.
5. Removal: When needed, gently lift from a corner; some pads release more easily with slow, steady pressure.

Always follow the included instructions, as adhesives and bathroom surfaces vary.

Many travel-size refillable bottles are designed with airplane travel in mind, but features vary:

• Size: Containers up to 3.4 fl oz (100 ml) generally align with common carry-on liquid rules. Always check current airline/TSA guidelines.
• Leak resistance: Look for tight flip caps, screw caps with gaskets, or pumps with lock mechanisms. Silicone bottles can help with pressure changes but may still expel air.
• Packing tips: Don’t overfill—leave a little space, tighten caps, and store upright in a quart-size bag.
• Test first: Give bottles a squeeze test at home and carry a backup zip bag for extra protection.

These steps can reduce leaks, though outcomes may differ with different formulas and conditions.