100g Postal Box Bottom Bags

Postal box bottom bags sized for the letterbox

Standard box bottom bags look great on a shelf — but they don’t fit postal boxes. These 100g postal box bottom bags do. Designed to slide into A5 mailers, they give your customers letterbox-friendly delivery while you save on shipping. In stock and shipped fast from our UK warehouse, with next-day UK delivery, low minimum order and the option to buy online.

For roasters running subscriptions, sending samples or packing gift sets, these solve a real problem: keep the premium box bottom format without oversized packaging.

Perfect for

• Subscription boxes – fits standard mailers, arrives through the letterbox
• Sample packs & tasters – professional presentation at 100g portions
• Gift sets – compact enough to combine multiples in one mailer
• Direct-to-consumer shipping – fewer failed deliveries with letterbox sizing

Specifications

Why UK roasters choose these

• Letterbox-friendly – fits A5 mailers, fewer “sorry we missed you” cards
• Recyclable materials – EVOH-PE / White PE, kerbside recyclable
• Degassing valve – releases CO2, keeps oxygen out, preserves freshness
• Smooth matte finish – premium feel in black or white
• Stable box bottom – stands upright for unboxing impact

Frequently asked questions

What size mailer do these postal box bottom bags fit?

They’re designed for A5 postal boxes (around 235mm x 165mm x 46mm internal), so they post straight through the letterbox.

What colours are available?

Matte white and matte black, both in a recyclable kerbside material.

Do they have a valve and zip?

Yes — a degassing valve to preserve freshness and a standard resealable zipper.

How fast is delivery?

In stock in our UK warehouse with next-day UK delivery on orders placed online before the cut-off.