Expanding zippered bag/ pack entrance

Traditional contracting rucksak mouth and modern clamshell zippered pack entrance – both have tradeoffs. Pack entrance shown below combines them and therefore inherits their advantages and disadvantages.


zipper pack back pack knapsack haversack entrance mouth

Details are somehow explained below but would be much more obvious in prototype.


– less loaded zipper;

– less long zipper;

– no drawstring needed, no protracting efforts, no crumpled fabric;

– still wide opening from top;

– relatively tightly closed, preventing the loss of belongins.


– more complexity;

– needs a flap over entrance for rain-proofing;

– does not allow full opening of pack;

– elastic cord needed to spread corners.

One thought on “Expanding zippered bag/ pack entrance

  1. Pingback: Expanding zippered bag/ pack entrance – prototype | Ironbound Concepts

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s